UV-C light refers to a section of wavelengths of the ultraviolet light spectrum, specifically 100-290nm. UV-C light disinfection devices frequently use UV-C bulbs that produce 254nm light due to their high efficacy in inactivating pathogens. Additionally, UV light disinfection devices commonly also use UVB light (290-320nm) or UVA light (320-400nm). However, studies indicate UVB and UVA light to be ineffective against the SARS-CoV-2 virus.UV-C light at 222nm, known as "Far UV-C Light," is also used in UV-C disinfection devices. 222nm UV-C light has been proven in recent studies to be effective against airborne novel human coronaviruses. Unlike 254nm UV-C light, "Far UV-C Light" can be used in occupied spaces as it does not cause harm to human tissues.