Light Environment before Nocturnal Sleep Focusing on Polychromatic LED Lighting

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  • LED照明に着目した夜間就寝前光環境の検討
  • LED ショウメイ ニ チャクモク シタ ヤカン シュウシン ゼン コウカンキョウ ノ ケントウ

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Abstract

The purpose of this study was to investigate that the effect of different types of spectral distributions on psychophysiological states during light exposure and the succeeding sleep. Participants were 20 young male adults without problems of sleep. Light conditions were five; incandescent lamp, incandescent lamp color or day white light color polychromatic LEDs using violet or blue excitation light. The light of violet excitation LEDs has more broad spectral distribution similar to natural light than that of blue excitation LEDs. Participants slept for seven hours after light exposure for about 100 minutes. The calculated non-visual effect from the short wavelength component was maximum in the day white light color LEDs using violet excitation light (P-LED_C). However, the falling rate of rectal temperature during light exposure in the day white light color LEDs using blue excitation light (B-LED_C) was worst of the five. Moreover, the sleep latency in B-LED_C was longest of the five. Therefore, B-LED_C showed the effect which was the most undesirable for sleep. The present study suggested that not only the optical characteristics of the short wavelength component but also the difference between the excitation light and the long wavelength component should be considered.

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