Ultraviolet (UV) radiation covers a wide wavelength range between 100 and 400 nm and is divided into three main areas, according to ISO standard 21348 — UV-A, UV-B, and UV-C. Typical applications in the UV-A range between 315 and 400 nm are UV curing or UV ink printing. Light sources in the UV-B range between 280 and 315 nm are mainly used in medical skin treatment as phototherapies. The UV-C range between 100 and 280 nm can be applied in air and water disinfection, which is currently very relevant in the fight against pathogens such as the novel coronavirus SARS-CoV-2.
The lighting industry has seen increased demand for UV-C radiation sources since the COVID-19 pandemic originated. UV-C radiation between 255 and 265 nm has been studied as a highly efficient method of inactivating the DNA or RNA of microorganisms, e.g. coronavirus, and prevents their replication and ability to actively infect