Abstract
As a critical factor in the built environment, lighting presents considerable influence on occupants. Previous research across static lighting conditions has found that both illuminance and correlated color temperature (CCT) affect occupants’ physiological and psychological functioning. However, little research has been conducted on the non-visual impacts of dynamic lighting with daily variation in illuminance and CCT levels. The purpose of this study is to better understand the impact of dynamic lighting on office occupants’ health, well-being and experience at a living lab. Fifteen participants were recruited to work in three office modules for four months. Four lighting conditions were designed and implemented in this study, including two static lighting conditions and two dynamic lighting conditions with a specific predefined control scheme. A prototype lighting system with enhanced control capabilities was configured and implemented to ensure the desired lighting environment protocol. Both objective methods and subjective surveys were used to assess the behavioral and physiological outcomes of interest, including mental stress, sleep, productivity, satisfaction, mood, visual comfort and perceived naturalness. The results showed that the daytime behavioral impacts were either positive or mixed. Specifically, a significant alertness increase was observed in the afternoon, indicating a potential solution to reduce the natural feelings of sleepiness during the workday. There was also a marginal benefit for mood. The nighttime impacts include a significant decrease in perceived sleep quality and sleep time after subjects were exposed to dynamic lighting. No significant differences were observed for mental stress, productivity, visual comfort, or perceived naturalness. The findings present additional insights into the non-visual impacts of dynamic lighting and give recommendations for further investigations.
Highlights
As a critical factor in the built environment, lighting presents considerable influence on occupants in multiple ways
This means that when participants were asked to comment on their overall stress at different time points during the day, or the overall stress and job-related stress across the entire lighting condition, they perceived no significant difference after being exposed to dynamic lighting compared to when they were exposed to the corresponding static lighting
Within the JP-specific lighting conditions, there were no significant differences in sleep onset time between static and dynamic lighting, which means that participants went to bed at approximately the same time
Summary
As a critical factor in the built environment, lighting presents considerable influence on occupants in multiple ways. With the help of various types of advanced lighting technologies and control schemes, dynamic lighting is able to mimic the daily variations in natural light [49,50,51] This may present many potential benefits to occupants, including increasing satisfaction, increasing perceived naturalness of electric lighting, improving alertness, performance, and synchronizing human circadian rhythms [52]. Dynamic variations in light may play a calming role, which may indirectly alleviate stress [53,54] Given these findings, dynamic light may be a potential solution to decrease stress during the day in office workers, while maintaining productivity, and improving satisfaction and sleep quality. This study was designed to better understand the impact of dynamic LED lighting with daily variation in illuminance and CCT levels. This study aimed to offer additional insights for a better understanding of the impacts of dynamic lighting on office occupants
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More From: International Journal of Environmental Research and Public Health
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