Each 20-Watt Filtered 222nm Far-UVC Lamp is hand-assembled and manufactured in an official ISO9001 Excimer Far-UV Light Factory (quality management systems) delivered by the Agency for International Standardization.  To provide the highest-quality Far-UV light products globally, a battery of testing that includes but is not limited to: Microbiological Effectiveness Test, IEC62471 (photobiological safety inspection), BACL ( 222m, wavelength test), and CE, FCC, RoHS Certifications.

  1. ● LCD Control Board with Remote Control
  2. ● Motion Sensor (Infrared)
  3. ● Timer Module For Looping
  4. ● 20-Watt Safety Filter Technology (Narrowband 222nm Emission)
  5. ● ZERO Mercury – Environment Friendly
  6. ● 5-Watt Peak wavelength 222nm
  7. ● Minimal Ozone Emission
  8. ● Wide Operating Temperature
  9. ● 20-Watts Instantaneous On/Off

When you need a 20-Watt Filtered 222nm, Far-UVC Lamp, make sure your Far UVC choice is always QuantaDose for the best Far-UVC lighting to meets your AP-UVGI needs. Our experts are standing by to assist you!

Sample Price $1700 each




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


When mounting an overhead Far-UVC ceiling light with a ceiling height of 10 feet, there’s a 75% drop in light power from 1 Foot to 2 Feet, but only a 5% drop in light from 4 feet to 10 feet with only 1% of the light power available at floor level.

For those without an intense knowledge of advanced mathematics (or even very basic mathematics for that matter), something such as the inverse-square law can seem incredibly daunting.

There are equations with numbers and variables, references to physics, and many more things which quite frankly seem very boring. For that reason, we’re going to try to cover this in a very practical way, rather than a technical one, and offer tools and charts that will make it even easier for everyone.  It can not be underscored enough how important it is to familiarize yourself with this basic mathematic principle to use the most cutting-edge bio-agent suppression method ever devised in human history – Far-UVC lighting.

The law itself, in AP-UVGI applications, using FAR-UVC light, applies to all lighting in general. It applies to any sort of electromagnetic radiation really. Its most relevant application here is germicidal irradiation using light wavelengths of between 207nm-230nm. This very narrow 23nm band of UV light was discovered as a small UV exposure window safe for humans yet deadly to pathogens responsible for the current pandemic!

In a nutshell, it teaches how to use UV light as a weapon in the War on Flu! The inverse-square law teaches us how light works over distance and why the distance between your light source and your target area is so important when the amounts of light reaching areas are paramount to the safety of people and the effectiveness of UVGI (Ultraviolet germicidal irradiation), or if adding Active Personal into the UV zone than, AP-UVGI, however just think of it as invisible light to keep things simple.

Let’s say we have a light source that is on full power and our bio-agent target is 1 foot away from it.  If our target moves double the distance away from the light (2 feet), how much of the light’s power will reach it? The natural reaction is to think “half power” – but unfortunately that’s now how light works, all light, including germicidal Far-UVC light all follow the inverse-square law of distance.

According to the law, the power of the light will be inversely proportional to the square of the distance. So if we take a distance of 2 and square it, we get 4, the inverse of which would be 1/4 or rather, a quarter of the original light power – not half.

Moving our target 3 feet from the light source (3 * 3 = 9, so 1/9) the power of our light on the target now becomes 1/9th of what it originally was, and this is where time becomes a very important factor for effective germicidal irradiation and for the safety of active personnel in the UV light disinfection zone over extended periods of time.

The below chart shows how the drops in light power work from one Far-UVC light mounted at a ceiling height of 300cm to the floor using a 20-watt 222nm excimer KrCl lamp properly bandpass filtered for a human-safe AP-UVGI application.



222nm Far UVC DF28C-20W Excimer Lamp

First UVC Bulb: Replacement 20W Far-UV Bulb

First UVC Module: Replacement 20W Far-UV Module:

First UVC Lamp 20W Round 222nm Excimer Lamp Details
Quick Details
Input Voltage(V): DC 24V
Lamp Luminous Efficiency(lm/w): 5000
Warranty(Year): 1-Year
Support Dimmer: No
Lighting: 222nm Far UVC Disinfection
Lifespan (hours): 4000
Voltage: 220V
Application: Home, Hotel, Office, Retail spaces,, Occupied areas, General areas, Restaurants,  Commercial locations, Airport, School
Power Supply: DC
Portable: No
Light Source: Quartz Tube
wavelength(nm): 222
UV Optiical Power(μW/cm2): 5000
Appplication Area(㎡): 30
Switch Mode: Remote Control, Manual Button, bluetooth, Motion Sensor
Rated Power: 20W
UV Wavelength: FAR-UVC 222nm
Input Voltage: DC24V
Safety Requirement: Mercury Free
Material: Quartz Glass Filter, Aluminum Alloy, PVC
Operating Temperature Range: -20℃ to 50℃
Warranty: 12 months
Life Span: 4000
Certification: CE/FCC/RoHS
Beam Angle: 60degree
Dimension: D.245*725mm