CAS Key Laboratory of Behavioral Science, Institute of Psychology, Chinese Academy of Sciences, Beijing, 100101, China.
Department of Psychology, University of Chinese Academy of Sciences, Beijing, 100049, China.
Sci Rep. 2021 Jan 28;11(1):2604. doi: 10.1038/s41598-021-81182-y.
Light, one of the key environmental components for both life and work, played significant role in subjective feelings (e.g. affect and comfort), but the exact effects and mechanisms were still to be determined. The present study screened thirty healthy adults (13 females, 22.45 ± 3.26 years) and examined subjective affect and comfort under short-term white lights with different combination of correlated color temperature (CCT) and illuminance at different times of day (e.g. morning, afternoon, and evening). Our results showed a significant interaction between illuminance level and time-of-day on subjective comfort. Participants felt more comfortable under 50 lx and 100 lx instead of 500 lx in the evening, and more comfortable under 500 lx in the morning and afternoon. In addition, a positive correlation between illuminance and comfort in the morning and a negative correlation between them in the evening were found. No significant effect of CCT on any subjective feeling was revealed. Our results necessitate the consideration of time-of-day in understanding lighting effects and application of healthy lighting in daily life.
光作为生命和工作的关键环境因素之一，对主观感受（如情感和舒适度）有重要影响，但确切的影响和机制仍有待确定。本研究筛选了三十名健康成年人（女性 13 名，22.45±3.26 岁），并在一天中的不同时间（如早晨、下午和晚上）下，使用不同相关色温（CCT）和照度组合的白光来检测短期主观情感和舒适度。我们的结果表明，照度水平和时间对主观舒适度有显著的交互作用。与 500 lx 相比，参与者在晚上感觉 50 lx 和 100 lx 更舒适，在早上和下午感觉 500 lx 更舒适。此外，还发现照度与早晨舒适度呈正相关，与晚上呈负相关。CCT 对任何主观感觉均无显著影响。我们的研究结果表明，在理解光照效果和日常生活中应用健康光照时，需要考虑时间因素。
