The draft ISO standard on determining solar irradiances (ISO-DIS-21348) describes the ranges listed in the table below.
Health-related effects of UVThe ultraviolet light (mainly UVA) that reaches the Earth's surface causes tanning and the production of vitamin D in the skin. It can also have harmful effects, such as skin cancer. This form of light is generated by tanning beds and booths to produce a suntan. Tanning beds are designed to emit only UVA rays; however, in practise they also emit some UVB, which is more likely to causing burning and skin cancer.
Ultraviolet light is also produced by welding torches, carbon arc lamps, and some lasers. Special precautions, such as the use of goggles, should always be taken when using such equipment.
UV light is sometimes used in phototherapy to treat skin disorders such as eczema, psoriasis, and jaundice in newborn babies.
Related category WAVES AND WAVE PHENOMENA
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