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Morning bright light for depressive symptoms
Meta-analysis of 20 RCTs showing morning bright light therapy (10,000 lux) significantly reduces depressive symptoms in adults with seasonal and non-seasonal depression.
Efficacy
- Effect size: 0.78 (large)
- Optimal dose: 30 min at 10,000 lux
- Response rate: 50-70%
Practical Protocol
30-minute exposure within 30 minutes of waking, positioned at eye level.
Outcomes
- Effect Size (Cohen's d / SMD)0.78