Quanta X Technology LLC (QXT), the manufacture of QuantaDose™, is an awarded, EDWOSB and (WOSB) woman-owned small business firm specializing in smart UVC security analytes, self-powered UV wavelength detection, UVGI, AP-UVGI, information technology, telecommunications, electronics accessories, and professional support services for Far UV engineering and manufacturing.
If you require any level of enterprise support for our suite of Quanta X Technology products or services, please get in touch with us via phone or email:
Unless the company or its agents are listed in a federal database forbidding us to do business. There are no restrictions that will prevent us from getting the far-UVC emitters and related components shipped directly to you.
DHL 3-5 day logistics service is our standard shipping. Until the exact size and weight of the package(s) are known for the order, the best I can tell you is that the average express shipping cost is between $150 and $300, depending on how many and what size samples are ordered. Depending on the size of a sample or restock order, free express shipping is offered when financially feasible to established wholesale accounts only.
Are there any minimum number of orders required for far-UVC lights?admin2021-04-21T04:32:55-04:00
Most design customization requires a minimum quantity of 100. Things like custom logo designs are available in smaller quantities depending on the reordering rate.
Given that many of QuantaDose’s far-UVC lights accept 24V DC power, can you tell us which millimeter barrel adapter for 24V DC adapters are compatible with QuantaDose’s lights?admin2021-04-21T04:29:15-04:00
All the 24v far-UVC devices come with a power supply and matching male and female barrel connectors. You can use any millimeter barrel connectors rated for use with 2 amps at 24 volts if you want to change them.
For the 24V DC power source, how many amperes should our power adapter supply to the far-UVC light?admin2021-04-21T04:27:31-04:00
The 24v input devices require 2 amps. As mentioned, all products will always come with a properly rated power supply. Preassembled Far-UVC products are plug-and-play directly from the included power supply with mounting hardware included.
While QuantaModules and QuantaBulbs require minor assembly with all wire connectors included. These are a use-your-own plug-and-play solution, which must always be assembled ONLY by a professional trained in high-voltage wiring.
International Commission on Non-Ionizing Radiation Protection (ICNIRP): exposure limit of 23 mJ/cm2 , or 0.000833 mW/cm2, for a continuous 8 hour period of Far-UV light exposure. What is the maximum watts to get below the exposure limit?admin2021-04-21T04:26:19-04:00
The distance is a factor here as well. Please see the spreadsheet calculator tool offered to help designers make determinations on time allowance with a known power and distance.
The below spreadsheet tool can help you figure out the time necessary to be effective UVGI and when the maximum levels of safe 222nm exposure have been reached under current international standards. USA 22 mJ/cm2 EU 30 mJ/cm2
This will have to do with the beam pattern and height of the Far-UVC device you design with the Far-UV bulb. As wattage is increased, the distance can be higher from the target, and the surface area covered increases with the same relative power on target. This is all relative to your design considerations.
How many Far UV Lights are recommended for a large area?admin2021-04-21T04:21:03-04:00
There are several design considerations, the height of the ceiling and how large of an area. Occupied or not occupied, the people are in transit or stationary. As a rule of thumb, most 20w far-UVC light devices can cover about 100 sq feet at 8-10 feet high.
Does the bandpass filter block the output intensity of light (studies say it blocks and emits about 60% of the light)?admin2021-04-21T04:19:12-04:00
The power output listed on each specification page for a complete Far-UV lamp assembly is measured at the bandpass filter. Transparence will have to do with material choice and impurities. The studies are correct. Passing very short UV wavelengths through any medium will affect output. However, you can not use the bulbs around people without 222nm Far-UV filtering of the higher wavelengths >230nm. Depending on how much of the lamp’s cost you want to be spent on the bandpass filter, you can achieve better than 60%.
Any tests done towards COVID? Any virus/bacteria efficiency count experiments done and what was the testing method?admin2021-04-21T04:17:57-04:00
Properly manufactured 222nm filteredFar UV KrCl excimer lamps produce the same Far-UVC 222nm peak. There are many studies available online using this exact filtered wavelength using KrCl excimer Far-UVC lamps. Several Far-UVC manufactures, including ours, have done third-party testing. We also provide discounts and donations to hospitals and schools to further research and awareness in this area. This information is the main topic throughout the QuantaDose.com website
Research breakthroughs in 2020 peer-reviewed studies on Far-UV irradiation for AP-UVGI applications.
It does say QuantaDose’s branding team can create a full range of options for OEM products to match corporate visual identity or new prod launch, what does QuantaDose mean by this and what are some offering examples?admin2021-04-21T04:14:52-04:00
a. If QuantaDose does, then can QuantaDose customize XYZW:
X: to moving light heads
Yes, minimum order requirements and other cost factors will apply.
Y: add a bunch of sensors – PIR, Contact, UV, Motion, Timer Module
Yes, minimum order requirements and other cost factors will apply.
Z: dimensions of BP filter
Yes, custom sizes can be cut easily with standard cutting lasers
W: BLE and App connection
Yes, minimum order requirements and other cost factors will apply.
**But still allow us to make changes on the go?
If you are paying for it, you can make as many changes on the go as you want. Min order requirements may be required depending on the changes and stage of current production.
*** What is the estimated total cost with these customized options?
You haven’t provided me any customization details or referenced a particular product for customizing. If you want to build a complete custom lamp, 100% of the specifications required, and there will be fees to complete the prototype design depending on what you are requesting as a final product.
How does QuantaDose help create and test proof of concept?admin2021-04-21T04:13:53-04:00
We can quickly generate prototypes with 3D printed models or an array of conventional manufacturing methods using ISO-certified environments. We can have your product design tested at ARE labs in the USA, help with the process of obtaining government and industry certifications in the USA only, and provide a strategically placed entry into the marketplace.
Any safety tests done to ensure no fire, no electrocution, no chemical/physical hazards? We would love to obtain QuantaDose’s DFMEA.admin2021-04-21T04:12:59-04:00
QuantaDose largely offers components to build Far-UVC lighting. Assembling these components such as power supply, ballast, and high voltage wiring must only be performed by a trained professional. Electrician, or electrical engineer with experience in high voltage circuits. Installation by untrained installed risk, fire, electrocution, and the most serious physical hazard – DEATH!
You can expect better design failure mode, and effect analysis as the public is informed about these new technologies. As it stands, 3 million people are dead, vaccines struggle with variants, and the worst variants may still come. The technology used is as standard as an office ceiling lamp with a ballast. The lighting industry has made enough light bulbs to feel good about the safety of manufacturing. With that in mind, AP-UVGI did get rid of the poison found in legacy UVGI mercury-line bulbs.
AP-UVGI devices are mercury-free Far-UVC bulbs and on many orders of magnitude safer than conventional UVGI or UR-UVGI applications. We will only build designs to the highest quality standards in an ISO cert factory to the standards of all applicable regulatory and quality control agencies. We can help attain all quality test certifications for any new Far-UVC light design you want to be manufactured using professionals in the industry.
Which microcontroller is QuantaGuard using?admin2021-04-21T04:12:17-04:00
That will depend on the model device being assembled. Custom microcontrollers used are programmed via a serial port protocol. However, on the fully assembled far UV light, the MC is accessible via USB.
Are they all printed circuit boarded or does QuantaGuard use an arduino?admin2021-04-21T04:10:12-04:00
Most FAR UV production devices today have MCs on circuit boards to control functions. However, none are using Arduino for production at this time.
If you’ve written your Firmware/Software on Arduino Uno to prototype light controls and functions, the ATmega328P microcontroller will allow for easy portability into a production-ready microcontroller programmable via USB.
Can QuantaGuard use an arduino for us so that we can make changes for customers if they want?admin2021-04-21T04:07:12-04:00
We can support the open-source community to develop this as a solution together with minimum order requirements and R&D in this area. To use the ATmega328P microcontroller, or ARM version would take rewriting the Firmware/Software and redesigning the current circuit’s architecture.
If you don’t absolutely need Arduino, you have access to the firmware via a USB programmable in C if you aren’t trying to port over something.
Does QuantaDose have any patents?admin2021-04-21T04:06:31-04:00
At QuantaDose, we have a bio-hazard we are dealing with, pushing innovation at every angle. Patents are not our focus. Making something new better every day, not holding on to an old way, not when it can be made better exponentially in a short time. We want everyone to build a better mousetrap! Quanta X Technology supports an open-source end to all pandemics! Medicine can hold it off; only our intellect in combination with technology can defeat it! Beat us to the Endgame! UVGi-Fi
Who are some of QuantaDose’s clients (if this is not confidential may we ask please)?admin2021-04-21T04:08:19-04:00
You can find YouTube reviews (top site navigation) from everyday people to large companies using QuantaDose products. Far-UV lighting products are only now picking up steam in the marketplace, with 100% of the research done in 2020 showing 222nm as effective against viruses and safe for people when filtered of longer harmful UVC wavelengths >230nm. Far-UV hasn’t received the media attention it deserves at all! But it will, a leftover consortium from the Trump era, and believers in hitting the body with a mighty light. The Highlanders use electromagnetic radiation in the invisible light wavelength of 222nm, deploying the shields they say are needed to protect humanity with this very powerful germicidal light.
I’ll share some cool pictures from a customer yesterday showing the most reflecting Far-UVC material on earth (Porex-PMR10 over 98 percent at 222nm) surrounding a 60 Watt Far-UVC excimer KrCl 222nm light bulb. First, check out the reflectance with Porex-PMR10, unreal!
TOP: 1st image, shows no far-UVC reflection || 2nd image amazing reflectance with Porex-PMR10 || 3rd image expected result for the line of sight irradiance of 222nm
BOTTOM: 1st image, QuantaDose glowing UV-C detects 222nm at 50m || 2nd image a 50-meter stroll from Far-UV Moon || 3rd image 60-watt Excimer KrCl 222nm Moonlight
Any recommended use hours, time points (periodical or continuous)?admin2021-04-21T04:04:03-04:00
QuantaDose UVC Light Test Card Questions and Answers From Amazon Customers
Amazon customer Stargazer asked, “My UVC lights do not show UV-C on the quantadose card, only the ultraviolet shows on the bottom. Are they phonys?”
First, let us make sure you aren’t assuming the UV-C indicator remains glowing after it is removed from the light source. The UVC indicator will only glow when exposed to direct UV-C light.
Remember, you must always protect your eyes and skin from UV irradiation and follow the light manufacturers’ guidelines when operating the device for safe usage in close proximity to any UV source.
As long as there is no misunderstanding of how step 1 works.
The short answer, if these UVC lights were marketed to you as UVC germicidal lights, then YES, they are 100% phonies when there is no reaction making UV-C glow, but it’s way worse than that because of the stage of the pandemic we are in today!
Nine months ago, those most at risk of mortality unsure of what types of UVC device to buy, and a wave of new companies entering into the UVC business trying to figure out how to measure UVC effectiveness made up a large part of our call volume, along with companies looking to utilize UVC to protect their customers.
This dynamic has changed dramatically. We now get calls from patients still laying in their hospital beds, recovering from weeks in ICU, gratefully looking forward to being released in days, unlike so many that walked into the same doors.
These people were the first to share how they are counting blessings for such a massive supply of oxygen being available here in the USA as their lives depended on ridiculously high-flow levels of oxygen to stay alive so they could avoid a ventilator.
However, when these COVID survivors return to their communities, homes, and workplaces, they will not be taking their safety for granted as they plan their decisive countermeasures while awaiting discharge from their life-saving medical care.
I have learned our worst fear we tried to circumvent through consumer education and easy-to-use QuantaDose UV-C test cards; unfortunately, they are a reality now; our worst fears about faulty unregulated consumer-grade UVC devices sold on marketplaces resembling a global wild-wild west (WWW) marketplace formally known as our global world-wide-web.
Remarkably right out in the open many of today’s commerce sites display little difference from the Dark Web’s notorious Silk Road!
2020 marks a sad year in online retail as anything was sold for a commission, no matter how deadly its potential was for the consumer, and falsely advertised UVC devices are among the worst offenders amidst record-setting online pandemic profits!
The deadly nature of these online UV sanitizer scams has gone full circle. Many people who COVID has stricken down fell victim to underpowered and outright fake UVC devices. By providing these victims a potentially very deadly false sense of protection.
Sellers on mainstream sites, typically based outside the USA, make outrageous claims in their advertising, showing a UVC device that can safely disinfect PPE like a mask, which requires a minimum of 1000 mJ/cm^ to meet CDC guidelines.
Let’s get a QuantaDose card and show the different Step 1 results under several light conditions to put the phony UVC products into a light wavelength that we can all see with our own eyes to spot the deception before it has the opportunity to become deadly.
I have several different wavelengths here, UVC bulbs and several UV/UVC LEDs, to mix to validate other wavelengths of light interference in Step 1 UV-C testing.
Now we will take some video footage of the UV-C indicator to demonstrate how different indicator colors can provide useful data on the wavelengths of irradiation being emitted from a UV device.
Words don’t illuminate long enough after opening uncle sanitizer so can’t tell if product worksadmin2021-01-22T08:02:40-05:00
Hello Avid reader, thank you for the product review in feedback, so it gives me a chance to reply. Please remember that the word ULTRAVIOLET in the lower test area is only visible at above 300 µW/cm², which is about 100mJ in 5:50 minutes, so if the letters can’t see the device failed the 300 µW/cm² power test! If you could see the word ULTRAVIOLET, great, it passed! If not much above 300 µW/cm², it will fade completely in 3 seconds max, more powerful devices up to 15 seconds. Blessings
In the below picture it gives you an idea of how light the color around the word ULTRAVIOLET is for a passing test when just reaching the min 300 µW/cm²
About the 2nd Gen Test Card, am I supposed to look at the color of the word ULTRAVIOLET or the color of its background?admin2020-12-18T01:40:13-05:00
The word ULTRAVIOLET is inverted, so the color around the letters makes the inverted word visible. The color depth is still light under 254 nm UVC calibrated at 300 µW/cm². This is the most meaningful point of reference. Photodegradation will have an effect on the shade of color long before visibility of the word ULTRAVIOLET is affected.
However the first thing to look for is a glowing UV-C on the top to make sure the UV intensity reading ( inverted word ULTRAVIOLET) is from within the UVC spectrum.
If the color gets darker after the word is visible you have reached above 300 µW/cm². We have tested a card for full color at 3000 µW/cm² in 15 seconds. That will be very unreliable in short order because of photodegradation. We have tested 300 µW/cm² in 15 second doses several hundred times without much difference in the intensity needed for word visibility.
If I can be of anymore assistance please let me know!
My issue is that the UVC light I bought lights up the word UVC but it is not green.admin2020-12-09T09:25:12-05:00
I got the Quantadose rapid uvgi intensity test card to check a UV light I got on Amazon. It has a number on the front if that helps QDZEQO4ZL2ZTJCZ2ND.
My issue is that the light I bought lights up the word UVC but it is not green.
Is this a problem? Should I send the light back?
Thanks for the input.
=======Starting Input ==========
The good news there is a UV-C led in the array, however, most of the UV power hitting the card is a longer wavelength than UV-C. Which is not an optimal wavelength for disinfection. There is a test you can do with the quantadose using a pair of regular none UV protected reading glasses – the dollar store kind.
The reading glasses will block the UV-C spectrum. This will be confirmed when you put the glasses between the top test area and your UV light. You will notice you can no longer see the UV-C at all.
Now do the same with the lower test area covering half the test area with the glasses and see if the color is the same shade under the glasses and direct light exposure.
If they are the same color you will know almost all the power from the UV light is in the wrong wavelength of UV to be truly called germicidal.
Many manufacturers add just enough UV-C to say it’s in the light – my guess would be 2 shortwave UVC LEDs and 4 longwave UV LEDs.
Take a close-up picture of the front LED’s and I can tell you. Personally, I would not use it!
The is no reason for UVB or UVA to be in an array of LEDs designed for UV-C sanitization. That’s a huge warning flag!
The truth is 90% of the LED lights made in China are doing this! As long as Americans keep buying them leaving 5-star reviews I suspect they will continue flooding the market with this junk that could be deadly for someone!
Fight back with a return label!
Does the uvc indicator at the top need to show a green color to confirm the presence of uvc? i saw a white color when directly in front of ledadmin2020-12-06T20:43:19-05:00
The bright green is what we want to see along with word visibility at the bottom. I am changing the answer to your question after talking to our lead engineer.
Ok, first the good news, real UV-C wavelengths are present for the letters UV-C to be visible at all.
But there is a party going on in there too. Led’s used in disco lights and those for detecting cat pee in the 395nm range can not cause fluorescence in the molecules in the UV-C test area. Yet, I say there is a party going on because it takes a blacklight’s wavelength to greatly change our visual perspective of the colors that reach our eyes (the same way a blacklight changes the reflected colors in a room).
The color green is the only color being emitted by the fluorescent analyte in the wavelength test which makes the letters UV-C visible.
However, toss some LED party lights into the mix, and our perception of the true reflected color will change.
It is not uncommon at all to see dubious manufacturers include many UV-A and UV-B LEDs into their so-called UV-C LED light arrays. Some models have 12 LEDs on the top and 12 LEDs on the bottom, but only two LEDs are real UV-C in what can be considered optimal UVGI wavelengths.
Recent studies on the sun’s effect on the virus focused on UV-A and UV-B wavelengths which showed to be helpful but not to be considered anywhere close to optimal germicidal wavelength to inactivate a virus. Excessive UVA and UVB light produced from a sanitization device should be a huge red flag!
So judging from what you have stated, your LED light source is UVC with LED blacklight color distortion coming from a strong UV-A led source between 380-400nm. I am ruling out UV-B because the blacklight effect is most apparent closer to the visual spectrum. For instance, very high power UV-A at 365 nm will have almost no effect on the color green emitted from the detector, while 395nm makes the green appear to glow a different color the same way as any 395 nm blacklight makes visible colors reflect back to our eyes at a different wavelength.
Simply cover half the lower area with that blocking the UVC, if you can’t tell a huge color difference then most of your UV power from the device is in the form of longer wavelengths in the UVA/UVB spectrum that was able to pass through the filter. Which are not optimal germicidal wavelengths of UV!
Also, you can take small pieces of tape and cover all the LEDs that don’t have brass looking metal housings and insides. The UVA LEDs should be more a white color inside the LED unless this manufacture went the extra mile to trick you with cheap low-cost LEDs….something that is taking place!
All you have to do is cover all the blacklight LEDs and the QuantaDose will glow bright green letters again. You’ll lose the white UV-C color contrast against the blueish-purple hue from the blacklight LEDs. Now, put the QuantaDose card back in front or inside the unit with all the blacklight LEDs covered and see if you get the word “ULTRAVIOLET” to become legible. If not, and I expect not too, you have will have confirmed the device is below > 300 µW/cm² UVC power.
Confusing to know if you are doing it rightadmin2020-12-04T09:18:54-05:00
At QuantaDose we don’t want you frustrated over technical lingo. This is why on the back of your 2nd edition QuantaDose card we included a toll-free support line so that you have access to real professionals in the USA that can help you achieve your stated goal exactly as you wrote: ” I just want to know if my light I ordered is actually killing germs and how long I need to keep it on/over a surface to make a difference.”
When the father of my 2-year-old fell and I was whisked into learning everything I could to keep the rest of my family safe which UVC played a big role. Including a family member, that had critical surgery postponed because of the virus for several months.
Before we created the QuantaDose there was no way for reusable rapid testing to confirm wavelength and intensity using a simple UV test card. All I wanted to know was the same thing as you. ” I just wanted to know if the light I ordered is actually killing germs and how long I need to keep it on/over a surface to make a difference.”
There was a way that was very expensive, single-use UVC dosimeters which is something I complained about to John from the other side of the door while he was separated from the rest of the family quarantined for an extended period of time.
The first thing you must understand is you aren’t just buying a UVC tester card when you purchase a QuantaDose. You are gaining a service with access to highly trained professionals in the USA at 1 800 713-9004 that can help you through whatever light testing or UVC setup questions you have. We don’t have a vested interest in the lights you use, only that you have real lights and enough power to do the job in the time you require.
There are hundreds of different style UVC lights on the market and we can walk you through the process of validating any of them with a live real person. 80% of the time that person with be the inventor of the card so no questions are too big or too small! The only bad question about testing UVC is the one that isn’t asked to ensure you are not using fake UVC lighting to protect yourself and your loved ones.
Please don’t turn down the support we offer when you purchase a QuantaDose. That support is just a phone call away (Phone number on the back of the test card). We are here for you to take the mystery and confusion out of the UVC disinfection process. We can’t help you leaving bad reviews, however, if you call our support line on the back of the test card you bought we can take any confusion out of the equation when it comes to verifying the UVC lights you are using as a virus precaution.
I’ve been in your shoes, and that is why we have designed a perfect UVC test card that provides quick answers to the same questions most owners of UVC lights want to know! We even have a dedicated phone support team to make it easy for people like me and you!
I really hope you will contact our support team to get to the bottom of your concerns about your UVC light! The QuantaDose is an amazing product, but it pails in comparison to our stellar phone support for interpreting test results and taking the mystery out of testing UVC!
Correcting Amazon’s Molly M. VINE VOICE Vine Customer Review of Free Productadmin2020-12-03T06:21:57-05:00
Correcting Misleading Customer Review By Molly M.
3.0 out of 5 stars Great for testing lighting
Reviewed in the United States on November 30, 2020
Vine Customer Review of Free Product( What’s this? )
2nd Gen QuantaDose UVC Light Test Card is great for testing your lights. In case you cannot tell if your UV-C light releases ozone from the scent, this card will do the job. It’s also good to determine the general wavelength of UV-A and UV-B lights, which are used to cure photo-polymers… most commonly known as gel nail lights. I only wish the fonts were a little larger, as you must approach the card to be very close to read it. I would prefer to be able to keep a longer distance between myself and my UV-C lights.
Please acknowledge that absolutely no UVC Light Test Card on earth can “do the job” to “tell if your UV-C light releases ozone” as you suggested.
The wavelengths that are able to escape a quartz tube UV-C low-pressure mercury lamp that produces ozone as a result of 184nm UV being absorbed by air molecules can not make it to the surface of the test card or anything else as ozone-producing wavelengths travel only far enough to come in contact with air when not in a vacuum.
It should also be noted that the human nose is the best detector of ozone. Many UV lamp manufacturers say you can return to a room far too soon. When in fact if you can smell ozone, the concentration in PPM is too high. The half-life of ozone has a relationship to humidity and before using ozone producing lamps one needs to do the proper safety research, and always trust your nose when it comes to ozone!
In this entire review, you fail to mention anything the 2nd Gen QuantaDose UVC Light Test Card does with respect to what it is designed to do. The 3-star review is a cruel unfair review judging from the contexts of your off-label usage of the QuantaDose product.
Well, now that we know the top of the test card will NOT detect UV that creates ozone because the top UV-C indicator is calibrated to glow between 200-280nm. The 184nm optimum wavelength needed for creating ozone is 184nm at about 15% of the mercury-line output and incapable of reaching further than contact with air which results in ozone production from absorption of energy thus can not make the UV-C glow.
The lower 2nd part of the QuantaDose test should not be burned up under nail gel light, the lower QuantaDose wideband photochromic material uses a large ease to see upper case word ”ULTRAVIOLET” that becomes legible confirming >300 µW/cm² UV-C intensity in the lower test area when exposed to 253.7nm “mercury-line” UVC light. This single point of calibrated word legibility in the lower test area starts at >300 µW/cm² when a confirmed UV-C source of light is used which is indicated by the letters UV-C glowing in the top test area in Step 1 on the QuantaDose 2 part test.
The text you are claiming is too small to be read while under UV light is part of the instructional text to help understand that wavelength, and not only power affects color concentration. Instructions should always be read before putting it under a UV light source. The indicator in step 1 is a large font letter UC-C that glows green. Step 2 uses a large front upper case word ”ULTRAVIOLET” with high contrast under UV that also remains purple after UV exposure for between 5-15 seconds to confirm >300 µW/cm² UV-C intensity.
When the UVC light was purchased it should have come with a warning not to look at that light, and that goes for reflections of UV-C light and exposure to the skin as well. If you are not aware of the warning from all UV-c light manufacturers please do not ever expose skin or eyes to UV-C germicidal light. A case shield and or UV 400 sunglass work as well with proper skin covering.
I hope you can see the error in your review and possibly reconsider rewriting it based on the facts of physics when it comes to ozone-producing UV wavelengths and maybe even post a review on the item for what it is designed to do. Just because it was received as a free product, doesn’t mean it shouldn’t be reviewed for its intended purpose as a UVC test card. Not ozone tester, which it cant detest, or to play with fingernail UV accessories. This is an important test card for people to make sure they are not buying fake UVC light and confirming a minimum UVC intensity from the device.
What do the qualitative colors correspond to in terms of microWatt/cm^ intensity?admin2020-12-03T04:08:39-05:00
This is a fundamental question to understand! When this is understood, it becomes obvious why the QuantaDose™ UVC intensity test card relies on a single point of calibrated word legibility starting at >300 µW/cm² when the uppercase word ”ULTRAVIOLET” first becomes legible in the lower test area when exposed to 253.7nm “mercury-line” UVC light. We have chosen not to use color differentials in shades for meaningful calculation other than a visual reference of UV intensity as stated on the QuantaDose UV-C test card’s backside.
IMPORTANT: The color correspondence of photochromic materials has as much to do with the Ultraviolet (UV) wavelength as it does the power of UV irradiance. Shorter wavelengths of UV, while more energetic, are absorbed very easily. For instance, UV-C never reaches the earth’s surface from the sun because it is 100% absorbed by the ozone layer.
Longer UV wavelengths such as UV-A and parts of the UV-B spectrum reach the earth’s surface; these wavelengths can easily penetrate the ozone layer and cause damage to our eyes and skin. These longer electromagnetic waves penetrate the wideband photochromic material used for the QuantaDose reusable UV intensity testing deeper with much less energy in terms of microWatt/cm^ intensity.
For example, It takes 300 µW/cm² UV-C irradiances at 253.7nm for the word ”ULTRAVIOLET” to first become legible. However, it only takes 3 µW/cm² UV-A irradiance at 365nm for the word ”ULTRAVIOLET” to first become legible.
That’s a huge difference in the radiant flux absorbed by the photochromic material, which results in a longer wavelength being absorbed deeper into the photochromic material resulting in deeper color concentration (Darker purple result) than shorter wavelengths that are absorbed easily by the surface of the photochromic material thus requiring much more power in terms of µW/cm² to get the same depth of penetration as longer UV waves can with a fraction of the radiant power in terms of the intensity measured in microWatt/cm^.
The QuantaDose UVC test card has a beneficial single point of calibration, which is the notification of irradiated power intensity greater than 300 microwatt-seconds per square centimeter. These days, it’s most often written as uW/cm2 or microWatt/cm^ as expressed in the question asked. This reference point for a meaningful UV-C intensity result requires confirmation of step 1 of the QuantaDose UVC test card indicated by brightly glowing letters UV-C fluorescing in the top test area.
QuantaDose now offers a UV-C filter card for use with LED array devices so a visual result can easily differentiate how much of an array of LEDs intensity is in the optimal UV-C range, quickly determining if an LED product has deceptively used multiple UV-A and UV-B LEDs in an array that produces very little UV-C intensity.
So the short answer is that color shade can only be used as a visual reference guide for intensity. The value in µW/cm² will determine the depth of color differently depending on the value of the wavelength of irradiance.
For this reason, the QuantaDose card is a 2 part UV test, first confirming short wave germicidal wavelengths with the letters UV-C and the uppercase word ”ULTRAVIOLET” becomes legible in the lower test area when exposed to 253.7nm “mercury-line” UVC light. This single point of calibrated word legibility in the lower test area starts at >300 µW/cm² when a confirmed UV-C source of light is used.
We hope this clarifies why the QuantaDose card is only sold as a wavelength indicator for optimum UV-C used in a germicidal application and confirming intensity is higher than 300 µW/cm², the word ”ULTRAVIOLET” becoming legible in the lower test area.
Please always remember we have highly trained people that can answer any questions you have from our QuantaDose support phone number 1 800 713 9004. Talk to someone with no vested interest in the brand of UV lights you use, only the best way for you to test them!
Interim CEO Katie Webb
Quanta X Technology LLC
If stored properly, how many times can the card be reused with accurate results?admin2020-11-12T00:19:50-05:00
The QuantaDose UVC Test card is much like any other measurement device with a finite life span for accuracy. To maintain the accuracy of any measurement device that is reusable which also has a finite life span requires a calibration procedure.
The QuantaDose UVC test card is very easy to test providing you have a known source of UVC power and distance.
1 – We recommend in our product listing to use a 3-watt UVC wand as these are the least expensive. Just hold the 3-watt bulb 1 inch away to confirm word visibility occurs in 15 seconds.
2 – When you first use your new QuantaDose card with whatever UVC device you are testing — simply note the distance from the bulb you are testing at the farthest distance from your UVC light source to reach the minimum power for word visibility in the lower test area. If the distance requires moving the UVC test card more than a 1/2 inch for word visibility as the card ages or as normal use causes photo-degradation — it is time to replace the test card.
3- Verify with UVC meter. This is an option for people that have professional UVC light meters but they use the QuantaDose to test in areas their meter probes can not get into.
The main factor for how many times you can reuse the card is the accumulative amount of exposure to UV radiation, and not the number of times the photochromic material is cycled between exposures. By keeping the exposure times to a maximum of 15 seconds will limit the photo-degradation effects on the photochromic material.
If you were to expose the test card twice as long as recommended i.e 30 seconds you can expect half the life span. I’ve personally left one under confirmed UVC lights over 2 hours at 300 µW/cm² which would equate to 480 times used in 15-second intervals and the card was still useable. I’ve also left one in direct sunlight under the noontime sunshine in Florida and the card was completely burned out when I got to it about 2 hrs later.
Short wave UVC is a much more energetic wavelength than both longer UVA and UVB wavelengths. The longer wavelengths of UVA and UVB can penetrate the photochromic material much deeper and thus photo-degradation effects happen much quicker in the natural sun than under UVC light. Limit exposure to the sun as much as possible for it to last as long as possible for testing UVC light
While the lower intensity test area does have a life span, the wavelength indicator in the top test area of the QuantaDose does not degrade so the test card will always detect germicidal wavelengths of UV-C by glowing green letters as long as the specialized narrowband analyte is still on the UVC test card.
I wish there was a straight forward answer to how many times the UV test card can be used. There are just too many variables, it would be impossible to give a set number of times the card can be used because everyone uses different wattage bulbs. One person can be testing 3-watt UVC bulbs while the other is testing 60-watt bulbs – time exposed to UVC and distance from the source is also a factor for accumulative exposure.
Short answer: It would be safe to assume if properly stored and UVC exposure is limited to 15 seconds intervals at between 300-500 µW/cm² for each test that several hundred tests can be performed.
We are sorry for the delay in answering your question today. We are located in the Tampa Bay area of Florida and we were lucky enough this Veterans Day to have Hurricane ETA downgraded to a tropical storm as it makes its way onshore just north of us. What a day, unreal to see a Veterans Day Hurricane!
Can the UV tester card be reused, if so how many times?admin2020-11-10T15:02:10-05:00
Yes, the QuantaDose is a reusable UVC measurement card.
There are two test areas on the QuantaDose UVC tester card!
1) First is a very narrow-band UVC analyte which uses molecular fluorescence to detect the wavelength. This top test area to detect UVC will work as long as the ink is on the card. You’d have to scrape it off to stop working.
2) Second is a very wide-band photochromic analyte that uses a quantum confinement effect to change color, of which all photochromic analytes DO have a lifespan. I’ll explain this lifespan.
The number of times the card can be used or the life span of a reusable QuantaDose™ UVC test card is related to photo-degradation that can affect the accuracy of intensity visualization.
The key determinant is the cumulative amount of exposure to UV radiation, and “not the number of times” the photochromic material is cycled between exposure. Because everyone is testing different wattage UVC bulbs it is impossible to provide an exact number of times the UVC test card can be used.
Providing the duration of UVC exposure is no longer than the recommended 15 seconds. The UVC test card will perform hundreds of tests, maybe many more. Quanta X Technology stopped testing at 200 exposures at 300 µW/cm² with very little photo-degradation occurring. However, as mentioned this will depend solely on the cumulative amount of exposure to UV irradiation and not “how many times” it is used.
The key is limiting UVC irradiation to no longer than 15 seconds and please don’t leave it exposed to direct UV sunlight for more than a few seconds as that will cause photo-degradation of the UVC test card in short order.
Also important is the environment in which the material finds itself since this can influence its photochemistry too.
QuantaDose™ UV test cards should be stored in dry conditions without exposure to UV light.
To figure out how the card is performing, calibration is easily done using a known UVC intensity and distance.
The easiest way is to use a 3-watt UVC bulb ( the most common inexpensive UVC light wands use this size UVC lamp) at 1 inch to confirm the intensity test area displays the word “ULTRAVIOLET” in approximately 15 seconds.
If you have no other known UVC light source you can always take the test card outside in the direct sun for just a few seconds, the word “ULTRAVIOLET” should appear almost instantly under the longer wavelength of UVA and UVB from the sun.
If you need any further support, pre or post sale please contact us at 1 800 713 9004.
UV Light Safety and Protection When Using The QuantaDose UVC Test Cardadmin2020-11-10T11:55:05-05:00
Initially, the QuantaDose was designed for fully protected UV light installers, UV sanitation workers, and homeowners to quickly visualize their UVC disinfection grid for the fastest, most effective UV lamp set up time. Under these conditions, FULL skin and eye protection are required.
The shorter wavelength of UVC means it is absorbed by materials such as PPE much easier than UVA and UVB. So if your protective clothing/skin covering is rated to protect you on a sunny day from UVA and UVB it will also be effective protection under the spectrum of UVC light.
We have tested the UV blocking additives sold on Amazon for washing normal clothes with very good results. You can use the QuantaDose test card for testing the effectiveness of UV protection of your clothes if you don’t have a UV/UVC meter. Simply put the card under a layer of the clothes before and after washing them with a UV blocking additive. While UV light is directed on the surface of the material between the test card and UVC light, note the color change of the Quantadose lower section before and after washing with a UV blocking additive.
Personally when I was caring for a sick family member UVC light placement and setup was a regular occurrence in my household. I took an old long sleeve thick cotton hoodie shirt (covers ears) and sweatpants washed them in the UV blocking additive mentioned above. I also used an easy to find a UV blocking Neck Gaiter (mask) with a full face shield rated UV400 and latex gloves. I was placing several lamps at a time which is extreme however the situation warranted the added disinfection precautions to keep everyone else healthy. Through the Grace of God and a lot of hard work cleaning air and surfaces no one else got sick!
If you are testing a single light, you might just be to consider propping up your phone to record the test outcome. Remember the test is done in 15 seconds, longer than that is overexposing the UV analytes which will affect life span and the calibrated point of reference aka word power visibility. Also, make sure your phone is not directly between the UVC light source and test card so there is no shadowing of the light you are testing.
The Quantadose test card will need to be within a distance to the light to reach a minimum power of 300 µW/cm² for the word “ULTRAVIOLET” to first appear visible in the lower intensity test area while the green UV-C is glowing.
All that said, if you don’t want to go the fully protect way, this is something your smartphone can easily record so your eyes can safely view the results of the UVC test. If you have any further questions about UVC PPE please reach out to our support line on our Amazon sellers page to speak to one of our team engineers!
Interim CEO, Quanta X Technology
What is the difference between 1st and 2nd gen QuantaDose UVC light test cards?admin2020-11-10T11:55:08-05:00
The most important differences between the 1st and 2nd edition QuantaDose™ UVC test cards pertain to usage of high power UVC industrial-grade PPE disinfection equipment.
2nd Edition Differences:
1) More Resilient PVC prevents aging/tanning when using high power UVC
2) Higher card to analyte contrast for better visualization of WPV (Word Power Visibility) when the calibrated minimum intensity point of 300 µW/cm² is reached when under 85% 253.7 nm with most of the remaining light energy peaking at 315 nm. Commonly referred to as the mercury line because this is the spectrum from low-pressure mercury lamps commonly used in the most trustworthy UVGI disinfection processes around the world.
3) Added UVC/UVB Color Scale Differential because it is important anyone using photochromatic analytes to visualize UV/UVC intensity understands that shorter wavelengths like UVC 200-280nm don’t penetrate the analyte used for UV intensity measurements as deeply as UVA or UVB which causes UVC to display a lighter color for a higher intensity wavelength.
The lighter analyte color when testing UVC is precisely the reason for the inverted word ” ULTRAVIOLET” first becoming legible during exposure to optimal UVC germicidal wavelengths while the color concentration is still light at 300 µW/cm² yet the word ”ULTRAVIOLET” is clearly visible in both UVC test card editions.
4) Batch numbers are printed on all 2nd edition UVC test cards for unprecedented quality control over the reliability and accuracy of photochromic materials used in manufacturing QuantaDose™ UVC test cards.
5) Questions about how to test a UVC light? The purchase of a 2nd edition QuantaDose™ gives you easy access to our world-class toll-free technical support line which is printed on the back of the UVC test card so QuantaDose™ customers can consult directly to highly trained engineers in the USA to answer questions on the best ways to test different devices and how to interpret UVC intensity results.
1st and 2nd edition QuantaDose™ cards both perform the same for general UVC analysis. The added durability of this 2nd Edition was designed for higher power commercial use. 1st edition QuantaDose™ UVC test card customers also have access to our world-class toll-free technical support line available on our Amazon sellers account page. 1st edition QuantaDose™ cards also work for gauging the SUN’s UV intensity so you can take necessary precautions such as sunscreen or shade, different design considerations were used as we expect the purchase for testing a single consumer-grade UVC lighting product limited the use case of the specialized photochromic UV analyte.
Besides the differences above, the professional 2nd edition design provides clear instructions on the two-step UVC testing process on the front of the card.
Where the 1st edition design provides a design for multiple uses for UVC light testing and/or use it for a UVA/UVB sun index card for maximum usefulness for end consumers in non-commercial UVC environments.
Interim CEO Katie Webb
Quanta X Technology LLC
Toll-Free Support: See Sellers Page
I tested their calibration on word power visibility! It’s surprisingly accurate as describedadmin2020-11-10T11:55:09-05:00
This is absolutely the only UVC test card on the market using a patent-pending method (WPV) of visualizing photochromic changes to within very accurate and meaningful UVC intensity readings in real-time.
I took a picture with a quality UVC meter proving exactly as the description says when the card is under a REAL germicidal UVC light the word ULTRAVIOLET first appears at 300 Micro-watt per square meter (µW/cm²).
I also included a picture of the card exposed to 555 µW/cm² so you can see the word is much better defined.
I went a step further in the video by using a small piece of glass to filter out the UVC. This little trick with the glass can be used to see how much UVA or UVB is mixed in with your UVC led light wands.
If the light contains UVA or UVB it will go through the glass as seen in this video of a fake UVC light wand. The missing letters UV-C glowing is a sure sign its fake before the glass test.
The card has a very-wide band intensity response and a perfectly calibrated wavelength indicator that glows green. Its very simple to use, when the UVC is glowing in the top, you can count of the word ULTRAVIOLET popping up at 300 µW/cm².
The fake test strips out there that cant give you a point of calibration are as bad as the fake lighting products!
You can’t tell if you have a good UVC light until you can measure the for the correct wavelength and if the UVC power level is within a germicidal range of intensity which the QuantaDose does both!
Wonderful innovation and great support that answered some very technical questions I had about that product. I highly recommend it!
It Looks Like Working As Advertised! Hoping the results of this card are all correct.admin2021-01-23T11:02:55-05:00
QuantaDose™ indeed discovered a revolutionary advancement in the preciseness of using photochromic analytes for UVC detection when inverted word power visibility (WPV) was introduced around the world with the 1st edition QuantaDose™ UVC test card that you purchased.
The QuantaDose™ UVC intensity test card relies on calibrated word legibility starting at 300 µW/cm² when the word ”ULTRAVIOLET” first becomes legible during direct exposure to UVC light. This is confirmed when the green UV-C is glowing in the top indicator of the QuantaDose™ UVC test card.
Considering color shades for UVC measurement in both irreversible and reversible photochromic analytes suffer from the same problem that was solved with QuantaDose™ WPV technology being added to photochromic analytes for UVC detection.
First and foremost is the ability to quickly visualize when a very close approximation of UVC intensity or accumulated dosage has been reached, depending on which UVC test is performed (single-use or reusable) using QuantaDose™ WPV technology. The development of a rapid test reversible UVC test card with a result that can be used for meaningful calculations would have been impossible without WPV calibration of word legibility.
QuantaDose™ created the world’s first reusable UVC intensity test that provides the most accurate visualization of any photochromic UVC testing technology by allowing users to quickly identify a written calibrated result for a more meaningful UVC measurement device with the introduction of word legibility. Designed and engineered in the USA, the QuantaDose™ WPV technology is the latest advancement in UV photochromic analytes detection and a break-through in visual accuracy!
QuantaDose™ UVC test cards are reusable but not invincible; over time, photochromic analytes will degrade being exposed to the powerful energy contained in UV light’s short wavelengths. This is referred to as photodegradation effects of the photochromic materials.
The easiest way to ensure accuracy is to hold the UVC light test card 1 inch from a three-watt source of UVC to test calibration is within tolerance for the calibrated inverted word power visibility (WPV) result. Any inexpensive three-watt UVC light wand that uses a mercury vapor bulb is our recommended light source at a one-inch distance for WPV to occur in no more than 15 seconds.
The key determinant in the accuracy of intensity measurements is the cumulative amount of exposure to UV radiation, and not the number of times the photochromic material is cycled between exposure. Longer than 15-second intervals of exposure to UV light will shorten the lifespan of reliable UVC test results.
Also, never leave the test card in sunlight, even if that is sunlight from window lighting in a room. It should be stored away from sunlight to avoid premature photodegradation effects. We suggest an air-tight and sun-blocking Mylar resealable bag for long term storage so the QuantaDose™ will provide reliable results for as long as possible by limiting humidity and sunlight from having an oxidative effect on the photochromic analytes used for UVC detection. With all that said, the QuantaDose™ results can provide the most precise reusable rapid UVC intensity testing results for a long time with proper care of the UVC test card.
I hope this adds confidence in your ability to always get the best long term results from your QuantaDose™ UVC light test card!
So if my uvc light takes 5 minutes to show the word ultraviolet, it’s intensity is around 20 times less than 300 uw/cm^2?admin2020-11-10T11:55:18-05:00
Please don’t leave the QuantaDose test card exposed to a UV source for 5 minutes. The QuantaDose UVC test card is designed for rapid intensity testing (15-second result), prolonged exposure will cause photodegradation effects to photochromic analytes.
There are three main types of UVC test cards on the market today. With the three of them come three very important and very distinctive differences between these UVC measurement cards.
Measurements of these three aspects of UVC radiation include its intensity, accumulative dose, and optimal UVC wavelength which are all critical detection factors of knowledge that will aid in the best UVC disinfection process.
1) UVC dosage test card
SINGLE USE! A UVC measurement card designed for testing prolonged dosage exposure (say 5 minutes or more) is a UVC Dosimeter Test Card, these are your typical irreversible medical-grade UVC test cards rated at 25/50/100 mJ/cm². These cards provide a final confirmation of an adequate UVC power level reaching a surface over the entire time of the disinfection process. These irreversible UVC test cards are rated for accumulative dosage rather than real-time intensity.
Function: Measures Accumulative Dose (one time use) Very effective, and expensive for single use.
2) UVC intensity test card
Reusable! A UVC measurement card designed for rapid UVC intensity testing (no longer than 15 seconds) is a QuantaDose UVC test card, this test is a lot like a credit card-sized meter with a single point of calibration starting at 300 µW/cm² with word visibility in the intensity test area. just like a meter, if the UVC light source is not putting out over 300 µW/cm² the meter will NEVER display 300 µW/cm², likewise, the QuantaDose UVC test card will NEVER display the word ULTRAVIOLET in the lower test area until the minimum intensity is reached, no matter how long the QuantaDose test card is exposed to the source, same as a meter would not measure intensity at 300 µW/cm² until that intensity is reached. Time isn’t the factor in intensity, overtime is dosage, not intensity. After the 15-second intensity test, providing you have reached at least 300 µW/cm² you can now calculate the dosage over time with a little math at distances closer and farther form the source just as you would be able to do with a UVC meter.
If you are not getting a color change displaying the word ULTRAVIOLET in the lower section of the Quantadose test card while the UV-C indicator is green within 15 seconds, the UVC light is likely not reaching the desired level of germicidal intensity required to achieve disinfection in under ten minutes and should be investigated, for either being aged UVC mercury bulbs or an inadequate or fake UVC product altogether.
Function: Measures Real-time Intensity (limited reuse) includes UVC wavelength indicator
3) UVC wavelength indicator test card
These are specialized UV currency counterfeit pigments in quality products like QuantaDose, and China also has a lot of the short-wave counterfeit green UVC ink sold on test strips to help promote their counterfeit UVC lights.
The QuantaDose UVC test card uses this specialized UV currency counterfeit pigments only to ensure you are measuring the correct UVC wavelength in the lower rapid UV intensity test area. (15 seconds max)
The reason this is important to understand is that this type of knock-off ink will glow even when power is below .001 µW/cm. The only thing this ink is confirming is the wavelength and a virus exposed to that low of a power level of .001 µW/cm. won’t even get a sun-tan.
Never use wavelength indicator ink to do anything but confirm that the wavelength is within UVGI range. To repeat, this style so-called UVC test card relying only on this wavelength indicator ink can not help you determine intensity or dosage as being effective. Buyers MUST beware of the misuse of this ink sold as a stand-alone UVC test product claiming to provide UVC testing for your devices!
I hope explaining the different types of UVC test cards on the market to test UVC helps to explain why only 15 seconds is needed the QuantaDose intensity testing, and how it differs from a UVC Dosimeter test that measures dosage over time, like 5 minutes you mentioned.
Please reach out to us on our 1-800 number listed in our Amazon profile if your like to talk to one of our engineers.
I hope this helps!
Interim CEO, Quanta X Technology
If the UVC bulb picks up band 200nms to 400 nms, is it correct to think that this dosimeter would not pick up a bulb emitting 180-185 nms?admin2020-11-10T11:55:21-05:00
The UVC emissions at 185nm are absorbed 100% by oxygen in the air, hence this is the ozone producing part of the electromagnetic spectrum. In low-pressure mercury-vapor lamps, there are spectrum lines present at 184 nm and 254 nm. Special fused silica glass is used in the manufacturing to keep the 184 nm light from being absorbed for maximum ozone production.
When you see UVC mercury-vapor lamps sold as non-ozone producing, that only means they changed the glass tube so these very short UVC wavelengths are absorbed in the glass tube itself. However, in the case that this 185nm wavelength can escape the glass tube, the 185nm wavelength can’t escape air molecules that undergo ionic changes while creating ozone to effectively block all the 185nm wavelength to within the distance of air molecules that surround the bulb.
Testing of these wavelengths requires a vacuum otherwise the only way to pick up a bulb emitting 180-185 nm is to measure the ozone in the air!
The good news is any UVC bulb with emissions of 180-185nm UVC will always peak output at 253.7nm which is why the QuantaDose UV analyte is designed to display the word “ULTRAVIOLET” at 300 µW/cm² under direct exposure to 253.7nm UVC
QuantaDose UVC test card is absolutely perfect for rapid testing of either ozone or non-ozone producing UVC bulbs!
I wish it would do a slow fade so I can really see it and not think it is my imagination, but compared to the other strips, this one turns a neon green when under UVC light and the UV purple turns a bright purple and slowly fades. I am glad I got this.admin2020-11-10T11:55:23-05:00
Hi, it sounds like you have confirmed you do have a real UVGI light. UVC wavelengths are shorter than UVA/UVB so the energy doesn’t penetrate the UV analyte as deeply, this results in UVC having a lighter color at higher energy values with shorter wavelengths. The lighter color, and a short time of color change before changing back to clear again, is the exact reason the word “ULTRAVIOLET ” is used with inverted text in the center of the lower test area. As long as you are able to read the word “ULTRAVIOLET ” you have reached the very minimum of 300 µW/cm² confirming a UVGI dosage in a reasonable amount of time.
The top green part is very sensitive to a narrow band of UVGI, thus only confirms that UVGI wavelengths are present, and not indicative of power at all because it will glow at only .001 µW/cm². The important part about the top is to confirm that you are using the lower wide-band photochromic UV analyte test area to measure actual UVGI intensity to referencable UVC calibration points.
As soon as the word “ULTRAVIOLET ” is visible you’ve hit 300 µW/cm², as the color gets darker up to the max of 3000 µW/cm² at full depth of color lasting about 15 seconds after exposure. The lighter the color purple the nearer to 300 µW/cm² intensity. The longer the word “ULTRAVIOLET ” is visible, the higher above the minimum 300 µW/cm² threshold for visibility reaction to occur.
When testing UVC, always look for words, and letters to become visible, not the color changes that happen. UVGI testing is 100% dependant on the visibility of the words in both test areas. In both test areas, the important point of known calibration to formulate meaningful calculations is the word visibility in each section.
Hi – so if the card reads “ULTRAVIOLET” after the test, does that mean it’s emitting enough UV light to sanitize most surfaces?admin2020-11-10T11:55:26-05:00
The word “ULTRAVIOLET” in the lower test area is the “key calibration point” for UVC intensity. This is dependant on when the word “ULTRAVIOLET” FIRST BECOMES VISIBLE, ( when you can first read the word under UVC light) as the known point of reference at 300 µW/cm² . Over-all color concentration is still very light at 300 µW/cm² which is why we use inverted word visibility centered around the UV analyte for a meaningful point of calibration. From the point of the word “ULTRAVIOLET” visibility at 300 µW/cm² to full-color concentration is proximately a ten-fold at 3000 µW/cm². That is a big spread for being useful except for knowing the darker it is above 300 µW/cm² word visibility it is on an order of magnitude more intense useful for general analysis.
The word visibility is starting at 300 µW/cm² is only calibrated for UVC light, therefore UVC intensity MUST be confirmed by top indicator with glowing UV-C letters. Otherwise, the UV analyte will only be measuring UVA and UVB radiation that is not considered within a germicidal range and the word visibility is not indicative of any point of calibration. You can use the color concentration for UVA and UVB as a UV sun index gauge, or to see if so-called UVC LEDs are just UVA/B wavelength range.
So only when the UV-C is glowing and the word “ULTRAVIOLET” becomes first visible, ( a very light color still). At this visibility point, you reached a point of known intensity which has the known potential of rapid UVGI disinfection meeting the requirement of 100 mJ/cm2 used on standard medical grade UVC dosimeter cards in about 5 minutes.
Here is how it works, let’s say you hold a real UVC light wand 6 inches from the QuantaDose UVC Test card for the word “ULTRAVIOLET” to become first visible, The way the units work is 1 Microwatt per (µW) of energy delivered = delivering 1 Microwatt (µW) of energy for 1 second. We know at 6 inches the UVC light delivered a minimum intensity of 300 µW/cm² and we want to get a close idea of how long it will take to reach a full-color change in a medical-grade 100 mJ/cm2 The answer is easy, 5 minutes and 55 seconds. Just calculate µW times seconds to reach the required dosage like this. .300*333 seconds equals 99.9 mJ/cm2
Keep in mind that is the word first being visible, if the color is darker and the word “ULTRAVIOLET” is very clear you know it is going to be much faster than that. However, you do have a real point of reference that you can confirm with one-time use cards with always the same result as the math within a small margin.
You can now apply the inverse square law of distance to calculate the time needed, either closer or farther away to reach the level required for your application. The inverse square law describes the intensity of light at different distances from a light source. Every light source is different, but the intensity ALWAYS changes in the same way. This means that as the distance from a light source increases, the intensity of light is equal to a value multiplied by 1/d2,. The relationship between the intensity of light at different distances from the same UVC light source can be found by dividing one from the other.
So as a direct answer to your question, if the word was just becoming visible to your eyes, under confirmed UVC light (green letters) it would take about 5 minutes and 55 seconds to achieve a full-color change in a one-time use 100 mJ/cm2
If you had a sanitizer box with the power level examples above with a timer for 2 minutes, 5 minutes, and 10 minutes. You know you’d need to run it 3 times back to back on the 2-minute setting, 5 minutes wouldn’t be enough either, so you’d always run the 10-minute cycle to get a full-color change of a medical-grade card 100 mJ/cm2 from that device.