Effect of Bright White Light on Non-Seasonal Depressive Disorder

A significant reduction in depressive symptoms was observed for all 30 patients during 7 days of treatment.

• Bright white light exposure was compared to dim light in patients with non-seasonal depression.
• No difference in treatment effectiveness was found between bright and dim light.
• Both observer and self-rating scales indicated a reduction in depressive symptoms during the treatment.
• The findings suggest that bright white light may not provide additional benefits for non-seasonal depression compared to dim light.

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