nephrosis neÂ·phroÂ·sis (nÉ-frÅ'sÄ­s) n. pl. neÂ·phroÂ·ses (-sÄz) Disease of the kidneys marked by degeneration of renal tubular epithelium. See nephrotic syndrome.
Ultraviolet light is a form of radiation which is not visible to the human eye. It's in an invisible part of the electromagnetic spectrum. Radiated energy, or radiation, is given off by many objects: a light bulb, a crackling fire, and stars are some examples of objects which emit radiation. The type of radiation being emitted depends on the temperature of the object.
UV Light. UV light is measured in microwatts of ultraviolet radiation per lumen of visible light (ÂµW/l). The high energy of UV radiation is particularly damaging to artifacts. UV light is not visible to the human eye and therefore removing it from museum lighting causes no change in appearance. Daylight is generally the strongest source of UV light; fluorescent, metal halide and mercury vapor lights also emit UV radiation.