ABSTRACT The spectral power distribution (SPD) of the indoor lighting environment can improve cognitive performance, as well as positively impact occupant wellbeing. Advances in solid-state lighting now allow the SPD of indoor light sources to change temporally to better match the dynamic quality of the natural environment. The present study sought to explore how rapid, dynamic changes in light SPD can impact cognitive performance and comfort compared to traditional, static indoor light fixtures. In this study, undergraduate students completed tasks measuring attention and processing speed, as well as questionnaires of sleepiness, emotion, and headache and eyestrain under traditional static lighting or a dynamic lighting condition consisting of fluctuations in light correlated color temperature (CCT) and constant illuminance. In Experiment 1, consistent, cyclical changes in CCT (4700–5300 K in a triangular wave pattern at a frequency of 0.03 Hz) were found to negatively impact participants’ processing speed and reported ability to focus. However, these impairments were accompanied by a decrease in negative affect. In contrast, stochastic changes in CCT used in Experiment 2 (4700–5300K in semi-random changes at a frequency of 0.03, 0.07, or 0.10 Hz) produced no measured effects on participant task performance, alertness, mood, or comfort, suggesting that a degree of unpredictability in the frequency of changes in light CCT may be less disruptive to occupant performance and focus than regular, cyclical changes. The preliminary findings from this small-scale study highlight the need for further research into how changes in the lighting environment might be beneficial or detrimental to occupant performance and comfort.

中文翻译：

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光谱功率分布的动态变化对认知表现和幸福感的影响

摘要 室内照明环境的光谱功率分布 (SPD) 可以提高认知能力，并对居住者的幸福感产生积极影响。固态照明的进步现在允许室内光源的 SPD 随时间变化，以更好地匹配自然环境的动态质量。本研究旨在探索与传统的静态室内灯具相比，光 SPD 的快速动态变化如何影响认知能力和舒适度。在这项研究中，本科生完成了测量注意力和处理速度的任务，以及在传统静态照明或由光相关色温 (CCT) 波动和恒定照度组成的动态照明条件下的困倦、情绪、头痛和眼睛疲劳的问卷调查. 在实验 1 中，发现 CCT 的一致、周期性变化（频率为 0.03 Hz 的三角波模式中的 4700-5300 K）对参与者的处理速度和报告的专注能力产生负面影响。然而，这些损害伴随着负面影响的减少。相比之下，实验 2 中使用的 CCT 的随机变化（频率为 0.03、0.07 或 0.10 Hz 的半随机变化中的 4700-5300K）对参与者的任务表现、警觉性、情绪或舒适度没有产生可测量的影响，这表明与定期、周期性的变化相比，光 CCT 变化频率的某种程度的不可预测性可能对居住者的表现和注意力的破坏较小。