A form of phototherapy using color to influence health and to treat various physical or mental disorders. The color rays may be in the visible or invisible spectrum and can be administered through colored lights or applied mentally through suggestion.

The treatment of disease by exposing the body to sunlight, a therapeutic use of sunbathing.

Treatment of the skin with flashlamps of prescribed wavelengths, fluence, and pulse durations which target specific chromophores to induce photothermolysis at specific locations in the skin such as at the hair follicle or spider veins.

Treatment using irradiation with light of low power intensity so that the effects are a response to the light and not due to heat. A variety of light sources, especially low-power lasers are used.

Therapy using oral or topical photosensitizing agents with subsequent exposure to light.

Photochemotherapy using visible light, usually red, topically or delivered locally by fiberoptic probe to tissues sensitized with hematoporphyrins.

The use of ultraviolet electromagnetic radiation in the treatment of disease, usually of the skin. This is the part of the sun's spectrum that causes sunburn and tanning. Ultraviolet A, used in PUVA, is closer to visible light and less damaging than Ultraviolet B, which is ionizing.

Photochemotherapy using PSORALENS as the photosensitizing agent and ultraviolet light type A (UVA).