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Filtered 222nm Far-UVC
Light Disinfection* Technology for Occupied Spaces

Technology designed to harm pathogens, not people

Schedule a consultation with a UV Lighting Specialist

Designed with Your Wellbeing in Mind

See Products**


Filtered 222nm Far-UVC Light Continual Air and Surface Disinfection Technology


Occupants can be Present

Filtered 222nm far-UVC light can be used while people are present in the space


Reduction of Pathogenic Bioburden

Inactivates viruses and bacteria


Autonomous Treatment

Continual air and surface disinfection technology

Filtered 222nm Far-UVC Light Technology Overview

Care222® filtered 222nm far-UVC light continual air & surface disinfection technology is designed to meet today’s American Conference of Governmental Industrial Hygienists (ACGIH®) safety guidelines for exposure to a filtered 222nm far-UVC light source when used within appropriate parameters.

Filtered 222nm Far-UVC Light Suggested Applications

Filtered 222nm far-UVC light technology can be used wherever people gather and interact. The ideal application is for this continual air and surface disinfection technology is when the goal is to inactivate pathogens as soon as they enter the space.








Transportation Hubs


Commercial Office



Acuity Brands will offer a variety of solutions powered by Care222® technology, a filtered 222nm far-UVC light continual air and surface disinfection technology


Whisper from Mark Architectural Lighting™


HDM from Healthcare Lighting®


BLT from Lithonia Lighting®


EVO® from Gotham® Lighting

Why Filtered 222nm Far-UVC Light in Occupied Spaces

Does Not Affect Eyes

The proteins on the top layers of the cornea of our eyes absorb 222nm far-UVC. When following safety guidelines, the 222nm wavelength does not penetrate these tissues to depths associated with cataracts, photokeratitis, and other eye conditions. In contrast, possible acute and chronic damage to eyes may result from the more generally employed 254nm UV wavelength used in many germicidal lamps. In addition, although lamps in the 405-430nm wavelength range can also be used in occupied spaces, they are not as effective against viruses as lamps with lower-range UVC wavelengths.

Does Not Affect Skin

In addition to not affecting the eyes, 222nm far-UVC is also does not negatively affect the skin, when used following safety guidelines. Filtered 222nm does not affect living skin cells because it does not penetrate beyond dead skin cells of the stratum corneum. In contrast, possible acute and chronic damage to skin may result from the more generally employed 254nm UV wavelength used in many germicidal lamps.

Importance of a Filter

The filtered 222nm technology utilizes an excimer lamp that employs a specially designed short pass filter to remove harmful UV wavelengths, resulting in a narrow band of UV centered at 222nm. Excimer lamps are arc discharge light sources with a special chamber filled with noble gas, completely mercury-free and without electrodes. Acuity Brands luminaires with Care222® far-UVC disinfection technology employ proprietary integrated controls to modulate pulses of the 222nm far-UVC to provide an appropriate dose that allows operation within the ACGIH safety guidelines.

Designing with Filtered 222nm Far-UVC Light in Your Space


1. Calculate planar irradiance in μW/cm2 at locations where pathogen reduction is desired and where people will interact


2. Convert planar irradiance to Dose in mJ/cm2


3. Confirm design is providing sufficient quantities of the filtered 222nm far-UVC based on expected performance to achieve targeted pathogen reduction within safety guidelines

Reach out to your Acuity Brands representative or click here for
assistance with designing your space for use with Filtered 222nm technology

Request Assistance

Frequently Asked Questions

  • How does filtered 222nm far-UVC light inactivate pathogens?

    The 222nm far-UVC light penetrates the outer layers of the pathogen structure to render it harmless through disrupting the nucleic acids (DNA and RNA), resulting in the disruption of vital functions, stopping the ability of the pathogen to replicate.

  • Why can filtered 222nm far-UVC light be used in occupied spaces?

    Because 222nm far-UVC light can be effective against wide range of bacterial and viral pathogens (up to 99.9% in 24 hours for studied pathogens) in relatively low doses, it can be used in occupied spaces and still fall within current safety guidelines for human occupancy, as established by the American Conference of Governmental Industrial Hygienists (ACGIH®).

  • Do all UV wavelengths have the same safety issues?

    No. The 222nm wavelength can be eye and skin safe at useable power levels, allowing the space to remain occupied during use. 254 and 274nm wavelengths are not eye or skin safe; requiring that the space be evacuated during use, used in upper room germicidal UV applications or in concealed applications.

Filtered 222nm Far-UVC Light Resources Built for You

Interested in Other UV Light Disinfection Technologies?

Learn More

*All references to “disinfection” are referring generally to the reduction of pathogenic bioburden and are not intended to refer to any specific definition of the term as may be used for other purposes by the U.S. Food and Drug Administration or the U.S. Environmental Protection Agency. The disinfection technology as incorporated in Acuity Brands products is not for use as or for medical devices. Reduction of the pathogenic bioburden is a function of fixture run time, distance to the UV light source, airflow, room size and/or other factors, and the level of reduction will vary within a specific space.

**Does not meet California air cleaner regulation requirements; cannot be shipped to California.

All trademarks referenced are property of their respective owners.