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How Home Lighting and Blue Light Filters Affect Melatonin Levels
Updated
Abstract
Essence
Cool white LED and CFL lamps were estimated to suppress melatonin more than warm or incandescent lighting, while very warm tunable lamps and brown-tinted lenses reduced the estimate.
Evidence
A laboratory measurement study of 52 lamps, four tunable LEDs, and eight blue-light-filtering lenses calculated , melanopic illuminance, and photopic illuminance, with cool white LED and CFL medians near 12% MSV versus lower values for warmer or incandescent sources.
Caveat
The study estimated circadian impact from light measurements and suppression values rather than measuring sleep or melatonin responses in people at home.
Simplified
Key numbers
12.1%
Cool White
Median for cool white lamps.
10% to 0.1%
Tunable Reduction
Reduction in melatonin suppression from tunable lamps at different color temperatures.
0.3%
Brown-Tinted Lens
Estimated melatonin suppression with effective brown-tinted blue-light-filtering lenses.
Circadian Biology