Spectral Tuning of White Light Allows for Strong Reduction in Melatonin Suppression without Changing Illumination Level or Color Temperature

Exposure to a light spectrum with low power between 450 and 500 nm but high power at shorter wavelengths resulted in no melatonin suppression at 175 lux.

• Melatonin suppression is most sensitive to light at wavelengths around 460 to 480 nm.
• Filtering out short wavelengths from white light reduces melatonin suppression but alters the light's appearance.
• Selective tuning of a white light spectrum can mitigate melatonin suppression without changing overall brightness or color temperature.
• In a study with 15 participants, exposure to low power between 450 and 500 nm, paired with higher power at shorter wavelengths, did not suppress melatonin levels.
• Conversely, high power between 450 and 500 nm led to almost 50% melatonin suppression under the same illuminance.

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