Ultraviolet sterilization lamps use period is about 1000h (hours). which the inner surface of the UV lamp emits a wavelength range of 200-270nm, sterilization of the center wavelength of 253.7nm, belonging to the short-wave ultraviolet.
This type of ultraviolet light is mainly through the microorganisms (bacteria, viruses, spores and other pathogens) radiation damage and destruction of nucleic acid function to make microorganisms lethal, so as to achieve the purpose of disinfection.
Safety note
Long-term exposure to ultraviolet radiation can lead to skin pigmentation, thickening and roughness of the skin, photoaging, and in severe cases, precancerous lesions, skin cancer, cataracts, and so on, so long-term exposure to ultraviolet radiation should be avoided.
Short-term exposure to ultraviolet sterilization lamps, the main hazards caused by electro-optical ophthalmia and skin damage, and other carcinogenic risk is minimal. Sterilization of ultraviolet lamps, is a short-wave UVC, penetration is extremely weak, mainly on the surface of the skin to do the most harm. Ultraviolet sterilization lamps on the human body to cause damage in the end, but also depends on the power and irradiation length.
The above content reference: People's Daily Online - mistaken UV lamps, in the end, how much harm will there be?