Circadian effectiveness of two polychromatic lights in suppressing human nocturnal melatonin

Aug 26, 2006Neuroscience letters

How two colored lights differ in reducing nighttime melatonin

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Abstract

Forty subjects participated in a study to assess the effectiveness of two light sources at suppressing nocturnal melatonin.

  • The study tested four different light levels (30, 100, 300, and 1000 photopic lux) using two lamp spectra (4100 and 8000 K).
  • Results indicate that the model can rank the effectiveness of the two light sources for melatonin suppression.
  • Nocturnal melatonin suppression appears to be a rate-limited response to light rather than solely dependent on light intensity.

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