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Light therapy or phototherapy (classically referred to as heliotherapy ) consists of exposure to daylight or to specific wavelengths of light using lasers , light-emitting diodes , fluorescent lamps , dichroic lamps or very bright, full-spectrum light , usually controlled with various devices. The light is administered for a prescribed amount of time and, in some cases, at a specific time of day. Common use of the term is associated with the treatment of skin disorders (chiefly psoriasis ), sleep disorder and some psychiatric disorders. Light therapy directed at the skin is also used to treat acne vulgaris , eczema and neonatal jaundice .