Frequently Asked Questions
Everything you need to know about 222nm Far-UVC technology.
222nm Far-UVC is a specific wavelength of ultraviolet light that can inactivate airborne bacteria and viruses while remaining safe for people in the room. Unlike conventional germicidal UV (254nm), 222nm light is absorbed by the outermost dead cell layer of human skin and the tear layer of the eye before it can cause damage.
Yes. Multiple peer-reviewed studies, including a landmark 66-week chronic exposure study at Columbia University, have found no evidence of skin damage, eye damage, or increased cancer risk from continuous 222nm Far-UVC exposure at recommended levels. The light cannot penetrate beyond the outermost dead cell layer of skin or the aqueous layer of the eye.
Studies show 222nm Far-UVC can inactivate over 99.9% of airborne pathogens including SARS-CoV-2, influenza, MRSA, and tuberculosis. A 2022 study in Nature Scientific Reports found that a single device in a room-sized chamber reduced airborne pathogen levels equivalent to approximately 184 air changes per hour.
Yes. This is one of the key advantages of 222nm Far-UVC over conventional germicidal UV. Conventional UV at 254nm requires an empty room because it is hazardous to human skin and eyes. 222nm devices are designed to operate continuously in occupied spaces — homes, offices, classrooms, hospitals — while people are present.
Both wavelengths are effective at killing pathogens, but they differ critically in human safety. 254nm UV penetrates living skin and eye tissue, making it dangerous for human exposure. 222nm UV has a much shorter penetration depth and is completely absorbed by the outermost dead cell layer of skin and the tear film of the eye, preventing damage to living tissue.
The ACGIH and ICNIRP safety limits for 222nm Far-UVC are 161 mJ/m² per day for eyes and 479 mJ/m² per day for skin. Well-designed commercial devices are engineered to operate well within these limits under normal usage conditions.
Leading research has been conducted at Columbia University Irving Medical Center, Harvard T.H. Chan School of Public Health, Kobe University in Japan, and the University of St Andrews in the UK. The technology has been featured in Nature, Scientific Reports, and other peer-reviewed publications.
Quality 222nm devices use filtered excimer lamps that do not produce significant ozone. The filtration removes wavelengths below 200nm that would otherwise generate ozone. Always look for devices with certified filtration and ozone testing documentation.
LUMENIZER is a brand of 222nm Far-UVC devices designed for home and professional use. The product line includes OMNI, BEAM, LITE, and PRO models for different room sizes and use cases. LUMENIZER devices are available through Club222 at club222.com.cn.
The Science page on Club222.org provides an overview of key research findings and links to peer-reviewed papers. You can also search PubMed for "222nm Far-UVC" to find the full body of academic literature.