Light therapy: Does it play an important role in Mental Health?

According to Lam1 based on his observations, research and literature review, initial use of light therapy in psychiatry arose from circadian rhythm hypotheses for seasonal and nonseasonaldepression. Suppression of human melatonin generally requires greater than 2,000 lux in terms of intensity of light. Exposure of patients to 2,500 lux white light for three hours in the morning and three hours in the evening may confer beneficial effects on mood. It is further suggested thatthere are no absolute contraindications to light therapy and there is no evidence that it would cause ocular or retinal damage.