What are the common types of UV-C light sources used by UV disinfection devices and how do they differ?
Most common types of UV-C light source are Cold Cathode Fluorescent Lamps (CCFLs) and Light Emitting Diodes (LEDs).
CCFLs generate UV-C light by applying electricity to the containing mercury, and the emitted UV wavelength is limited to 254nm. Once turned on, the lamps take time, usually in minutes, to reach full UV output.
LEDs, on the other hand, do not contain mercury and can be designed to emit specific wavelength such as 265nm which is most ideal for germicidal applications. Once turned on, LEDs can instantly reach full UV output for rapid disinfection applications. Their much smaller size also make them ideal for use in portable and lightweight devices.