Minimal, superficial DNA damage in human skin from filtered far‐ultraviolet C

Krypton-Chloride (Kr-Cl) excimer lamps have a peak emission wavelength of 222 nm in the ultraviolet-C (UV-C) region of the electromagnetic spectrum. Currently Kr-Cl lamps are the only viable "far-UV-C" sources for full-room inactivation of airborne SARS-CoV-2, the virus responsible for the COVID-19 pandemic1 . Commercially available Kr-Cl excimer lamps can be retro-fitted to existing room lamp fittings or mounted at ceiling height independently. Other technologies, such as light emitting diodes (LEDs), are currently neither efficient nor powerful enough for such a task.