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UV-B lamps
UV-B lamps are lamps that emit a spectrum of ultraviolet light with wavelengths ranging from 290-320 nanometers. This spectrum is also commonly called the biological spectrum due to the human body's sensitivity to light of such a wavelength.〔http://www.iarc.fr/en/publications/pdfs-online/wrk/wrk1/ArtificialUVRad&Skin4.pdf〕 UV-B light does not tan the skin very much, compared to the UV-A lamps that are used in tanning beds.
==Treating skin diseases==
The main diseases that are treated with UV-B lamps are psoriasis, lichen planus and atopic dermatitis (eczema).,〔http://www.webmd.com/skin-problems-and-treatments/psoriasis/news/20090507/treat-psoriasis-at-home-ultraviolet-lamps〕 vitiligo (loss of skin color) and some other skin diseases.
There are thousands of dermatology clinics around the world that treat skin ailments with UV-B lamps. Many people who suffer from psoriasis or other skin diseases have their own UV-B lamp for home treatment. A small lamp is used to treat limited areas of the skin, while full body cabins are available in clinics and hospitals.
Overexposure to UV-B light can burn the skin, so the exposure time must be regulated by a timer that turns off the lamp.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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