Frequently Asked Questions

Ultraviolet light at 222 nanometers wavelength. It kills bacteria, viruses, and fungi on contact but cannot penetrate human skin or eyes. Traditional UV-C at 254nm is dangerous to people; far-UVC at 222nm is safe in occupied spaces.

Yes, within regulatory limits. The ACGIH threshold is 22 mJ/cm2 over 8 hours for 222nm. Over 50 peer-reviewed studies confirm no skin or eye damage at regulated exposure levels. The dead outer skin layer absorbs the light before it reaches living cells.

Yes. A 2022 Nature study demonstrated 98% reduction of airborne SARS-CoV-2 within 5 minutes of continuous 222nm exposure. It also kills influenza, MRSA, TB, norovirus, and other pathogens.

Consumer desk lamps: $300-600. Commercial ceiling fixtures: $800-2,000. Operating cost: $5-15/year electricity, $100-300 lamp replacement every 5,000-10,000 hours. Similar to running a ceiling fan.

Cost (still $300-2K per fixture), regulatory caution (government agencies are conservative), and low public awareness. The technology works. Adoption is the bottleneck. COVID accelerated interest but deployment is still early.