The use of UV-C has a long history. In the late 1800 century, research proved that UV-C light could be used to eliminate bacteria and viruses.
Artificial UV-C produced by electric lamps has previously been used for sterilization and disinfection. There have been applications of high-frequency wave light UV-C for decontaminating water, and there have been UV-C applications for air sanitation. Currently, more than 6000 water plant treatment plants are using UV-C in Europe because of the lights superior effectiveness to eliminate bacteria.