Light therapy is exposure to daylight or specific wavelengths of light (polychromated polarised light, lasers, LED, fluorescent lamps, dichroic lamps, or very bright full-spectrum light). The light is administered for a prescribed amount of time, or even specific times of day.

• Skin conditions, including:
  • Psoriasis
  • Acne vulgaris
  • Eczema
  • neonatal jaundice
• When striking the retina of the eyes:
  • Cicardian rhyhm disorders such as delayed sleep phase disorder
  • Seasonal affective disorder, and even non-seasonal psychiatric disorders

• Jaundice