Blue Light Limit For Melatonin Production

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Evening residential illumination possesses the capacity to impair sleep quality via the suppression of endogenous melatonin production , a process largely driven by short-wavelength ( blue ) light .

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Many groups have also reported that inadequate artificial lighting interferes with melatonin production and disrupts the circadian rhythm. Not all blue light is created equal: the wavelengths that suppress melatonin production and disturb sleep are in the range of 460-500 nm, but blue light from 380-450 nm does not have the same effect.

Melatonin suppression is highly sensitive to blue -rich light . Studies suggest that exposure to light levels as low as 10 to 50 lux at the eye, especially if rich in blue wavelengths (short-wavelength), can significantly suppress melatonin production in humans.

Blue light exposure in the evening suppresses melatonin production by up to 50 percent and delays its onset by roughly 90 minutes. The dose-response relationship is nonlinear — even moderate-intensity screens at close range can produce significant circadian disruption.

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The inner clock—Blue light sets the human rhythm - Wahl - 2019. This note connects the source idea with the visuals in a simple, reader-friendly way.

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