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Circadian Potency Spectrum with Extended Exposure to Polychromatic White LED Light under Workplace Conditions
How Different Strengths of White LED Light Affect the Body’s Internal Clock During Long Workplace Exposure
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Abstract
A narrow steady-state human peaks at 477 nm.
- Light exposure at night may disrupt the circadian timing system and is associated with various health disorders.
- Previous definitions of circadian spectral sensitivity primarily focused on dark-adapted conditions with limited wavelength sensitivity.
- This research suggests that light-adapted circadian spectral sensitivity may be predominantly blue, with a narrower range than previously thought.
- Extended exposure to light-adapted conditions showed that the circadian spectral sensitivity includes a peak at 477 nm and a range of 438 to 493 nm.
- The findings could aid in developing LED light sources that minimize circadian disruption in daily life.
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Key numbers
5×
Variation in Melatonin AUC
Comparison of melatonin AUC across different LED light sources.
477 nm
Peak Circadian Potency Wavelength
Identified peak of the .
55 nm
Full-Width Half-Maximum
Width of the .