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Light effects on melatonin and circadian rhythm
Comprehensive review of how light wavelength, intensity, and timing affect melatonin suppression and circadian phase, with implications for sleep and health.
Melatonin Suppression
- Peak sensitivity: 460-480nm (blue)
- Threshold: 30-50 lux
- Full suppression: 100+ lux
Phase Shifting
Morning light advances; evening light delays circadian clock.
Outcomes
- Melatonin Suppression-65