Is there a difference in clinical efficacy of bright light therapy for different types of depression? A pilot study

Depressive symptoms improved significantly for participants after 30 minutes of Bright Light Therapy daily for up to 3 weeks, with p<.05.

• The study involved 48 outpatients with major depressive disorder, divided into those with melancholic features and those with atypical features.
• Improvements in depressive symptoms were observed with a moderate effect size (d=-.53).
• The benefits of Bright Light Therapy appeared stable over a 4-week follow-up period.
• No significant differences in treatment efficacy were found between melancholic and atypical subtypes of depression.
• Seasonality did not significantly affect the improvement of depressive symptoms after Bright Light Therapy.

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