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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 which strikes the retina of the eyes is used to treat [[circadian rhythm]] disorders such as [[delayed sleep phase syndrome]] and can also be used to treat seasonal affective disorder, with some support for its use also with non-seasonal psychiatric disorders.
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