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Effect of Color Temperature and Illuminance on Psychology, Physiology, and Productivity: An Experimental Study

Author

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  • Ruijun Chen

    (Department of Architecture, National Cheng Kung University, Tainan 701, Taiwan)

  • Meng-Chun Tsai

    (Department of Architecture, National Cheng Kung University, Tainan 701, Taiwan)

  • Yaw-Shyan Tsay

    (Department of Architecture, National Cheng Kung University, Tainan 701, Taiwan)

Abstract

In this study, we investigated the impact of the lighting environment on psychological perception, physiology, and productivity and then designed lighting control strategies based on the experimental results. The research was conducted in a smart lighting laboratory, and 67 subjects were tested in different illuminances and correlated color temperatures (CCTs). During the experiment, the physiological data of subjects were continuously recorded, while the psychology and productivity results were evaluated by questionnaires and working tests, respectively. The experimental results found that both illuminance and CCT could significantly influence the feeling of comfort and relaxation of the subjects. Warm CCT and higher illuminance (3000 K–590 lux) made subjects feel more comfortable. Productivity reached its maximum value with illuminance above 500 lux and equivalent melanopic lux (EML) higher than 150. The brain-wave and heart-rate changes did not have a close relationship with either illuminance or CCT, but the heart rate slightly increased in the adjustable lighting mode. Regardless of the initial value setting, the subjects preferred intermediate CCT (4200 K) and bright illumination (500 lux) after self-adjustment. Finally, we proposed three comprehensive lighting control strategies based on psychology, productivity, circadian rhythm, and energy-saving.

Suggested Citation

  • Ruijun Chen & Meng-Chun Tsai & Yaw-Shyan Tsay, 2022. "Effect of Color Temperature and Illuminance on Psychology, Physiology, and Productivity: An Experimental Study," Energies, MDPI, vol. 15(12), pages 1-23, June.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:12:p:4477-:d:842852
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    References listed on IDEAS

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    1. Dariusz Czyżewski & Irena Fryc, 2020. "The Influence of Luminaire Photometric Intensity Curve Measurements Quality on Road Lighting Design Parameters," Energies, MDPI, vol. 13(13), pages 1-17, June.
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    Cited by:

    1. Ao Jiang & Xiang Yao & Stephen Westland & Caroline Hemingray & Bernard Foing & Jing Lin, 2022. "The Effect of Correlated Colour Temperature on Physiological, Emotional and Subjective Satisfaction in the Hygiene Area of a Space Station," IJERPH, MDPI, vol. 19(15), pages 1-14, July.
    2. Na Yu & Yue Lv & Xiaorong Liu & Shuai Jiang & Huixuan Xie & Xiaofan Zhang & Ke Xu, 2023. "Impact of Correlated Color Temperature on Visitors’ Perception and Preference in Virtual Reality Museum Exhibitions," IJERPH, MDPI, vol. 20(4), pages 1-18, February.
    3. Yusen Lin & Cheng-Chen Chen & Yasser Ashraf Gandomi, 2023. "Strategies on Visual Display Terminal Lighting in Office Space under Energy-Saving Environment," Energies, MDPI, vol. 16(3), pages 1-14, January.

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