Department of Electrical Engineering and Bioscience, Graduate School of Sciences and Engineering, Waseda University, TWIns, Wakamatsucho 2-2, Shinjuku-Ku, Tokyo, 162-8480, Japan.
The Smart Life Science Institute, ACROSS, Waseda University, Tokyo, Japan.
Sci Rep. 2020 Jul 8;10(1):11204. doi: 10.1038/s41598-020-68119-7.
Light exposure before sleep causes a reduction in the quality and duration of sleep. In order to reduce these detrimental effects of light exposure, it is important to dim the light. However, dimming the light often causes inconvenience and can lower the quality of life (QOL). We therefore aimed to develop a lighting control method for use before going to bed, in which the illuminance of lights can be ramped down with less of a subjective feeling of changes in illuminance. We performed seven experiments in a double-blind, randomized crossover design. In each experiment, we compared two lighting conditions. We examined constant illuminance, linear dimming, and three monophasic and three biphasic exponential dimming, to explore the fast and slow increases in visibility that reflect the dark adaptation of cone and rod photoreceptors in the retina, respectively. Finally, we developed a biphasic exponential dimming method termed Adaptive Light 1.0. Adaptive Light 1.0 significantly prevented the misidentification seen in constant light and effectively suppressed perceptions of the illuminance change. This novel lighting method will help to develop new intelligent lighting instruments that reduce the negative effect of light on sleep and also lower energy consumption.
光照会降低睡眠质量和持续时间。为了减少这种光暴露的有害影响，重要的是要使光变暗。然而，调光往往会带来不便，并降低生活质量。因此，我们旨在开发一种睡前使用的照明控制方法，该方法可以在主观感觉光照变化较小的情况下降低灯光的照度。我们采用双盲、随机交叉设计进行了七项实验。在每个实验中，我们比较了两种照明条件：恒定照度、线性调光以及三种单相和三种双相指数调光，以分别探索反映视网膜中视锥和视杆光感受器暗适应的快速和缓慢可见度增加。最后，我们开发了一种称为自适应光 1.0 的双相指数调光方法。自适应光 1.0 显著防止了恒定光下的误识别，并有效地抑制了对照度变化的感知。这种新颖的照明方法将有助于开发新的智能照明仪器，减少光对睡眠的负面影响，同时降低能源消耗。
