Recent studies reported that bright light exposure can impact mood and cognitive functions in various age groups. However, these studies have not adequately addressed the effects of ambient lighting in living spaces on healthy older adults. In the present study, the effects of a whole-day lighting scheme were examined in residential units inhabited by older adults. The lighting condition (L_T) was designed to create a direct/indirect ambient illumination that delivered bright, blue-enriched light (illuminance level: 500 lx, Correlated Color Temperature (CCT): 6500 K) in the morning, followed by gradually lower illuminance levels and CCT throughout the rest of the day, reaching 100 lx and 2700 K in the evening. To further examine the effects of spectrum, we also included another lighting condition (L_P) with the same range of illuminance levels and constant CCT of 2700 K from morning to evening. Twenty-one healthy older adults (mean age = 76.81 years; 16 females) completed a counterbalanced crossover experiment, with two baseline measurements (before and after interventions) and eighteen days of interventions. Data were collected using standardized questionnaires and tests. Significant improvements were observed in mood and cognitive functions measured after exposure to both lighting conditions (L_P and L_T); there were significantly greater improvements for the L_T as compared to the L_P condition. This study found promising evidence that a whole-day lighting scheme that follows the natural light/dark cycle could be an effective design solution to create a healthy and healing living environment in living spaces and promote mood, cognitive functions, and hence the quality of life in senior residents.

最近的研究报告说，强光照射会影响不同年龄组的情绪和认知功能。然而，这些研究还没有充分解决生活空间中环境照明对健康老年人的影响。在本研究中，在老年人居住的住宅单元中检查了全天照明方案的效果。照明条件 (L _T ) 旨在创建直接/间接的环境照明，在早晨提供明亮的富含蓝色的光（照度水平：500 lx，相关色温 (CCT)：6500 K），然后逐渐降低白天其余时间的照度水平和 CCT，晚上达到 100 lx 和 2700 K。为了进一步检查光谱的影响，我们还包括了另一种照明条件（L_P ) 具有相同范围的照度水平和从早到晚的恒定 CCT 为 2700 K。21 名健康老年人（平均年龄 = 76.81 岁；16 名女性）完成了一项平衡交叉实验，包括两次基线测量（干预前后）和 18 天的干预。使用标准化问卷和测试收集数据。_{在暴露于两种照明条件（L P}和 L _T ）后测量的情绪和认知功能显着改善；_{与 L P}相比， L _T的改进明显更大健康）状况。这项研究发现有希望的证据表明，遵循自然光/暗循环的全天照明方案可能是一种有效的设计解决方案，可以在生活空间中创造健康和治愈的生活环境，并促进情绪、认知功能，从而提高生活质量在老年居民中。