Dose relationships of morning bright white light in seasonal affective disorders (SAD).
Bright white full spectrum light (greater than 2500 lux) can improve depressive symptomatology in a selected group of patients with recurrent autumn and winter depression. This crossover study demonstrates that 0.5-h morning white light is not an effective treatment, whereas 2-h is.
D002940:Circadian Rhythm; D006801:Humans; D019964:Mood Disorders / Q000503:physiopathology / Q000628:therapy*; D010789:Phototherapy; D012621:Seasons