Effects of Illuminance and Correlated Color Temperature on Daytime Cognitive Performance, Subjective Mood, and Alertness in Healthy Adults

This study investigated the impact of indoor illuminance and correlated color temperature (CCT) on healthy adults’ cognitive performance, subjective mood, and alertness during daytime office hours and differences in time-of-day effects. A 2(illuminance) × 2(CCT) × 2(morning vs. afternoon) mixed desi...

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Bibliographic Details
Published in:Environment and behavior 2019-02, Vol.51 (2), p.199-230
Main Authors: Zhu, Yingying, Yang, Minqi, Yao, Ying, Xiong, Xiao, Li, Xiaoran, Zhou, Guofu, Ma, Ning
Format: Article
Language:English
Subjects:
Adults
Alertness
Brightness
Cognition
Cognitive ability
Cognitive tasks
Color
Color temperature
Daytime
Emotions
Face recognition
Illuminance
Lighting
Long term memory
Mood
Pattern recognition
Positive emotions
Short term memory
Sleepiness
Time dependence
Time of use
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Summary:This study investigated the impact of indoor illuminance and correlated color temperature (CCT) on healthy adults’ cognitive performance, subjective mood, and alertness during daytime office hours and differences in time-of-day effects. A 2(illuminance) × 2(CCT) × 2(morning vs. afternoon) mixed design (N = 60) was employed. Participants felt less sleepy in the bright light exposure. The low “cool” lighting induced the least positive mood. The effects of illuminance and CCT on subjective feelings were not time-of-day dependent. The results demonstrated the slowest responses in inhibition, working memory, and recognition of facial expression tasks in the low “warm” lighting. The effect on long-term memory was most pronounced under the high “cool” light exposure, but only in the afternoon for recognition of neutral words. The findings suggest that future research on good indoor lighting should consider illuminance levels and CCT as well as other variables to optimize lighting effects during regular daytime hours.
ISSN:0013-9165
1552-390X
DOI:10.1177/0013916517738077