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Study of the Effects of Daylighting and Artificial Lighting at 59° Latitude on Mental States, Behaviour and Perception

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Listed:
  • Federico Favero

    (Lighting Design Division, KTH Royal Institute of Technology, ABE School of Architecture and Built Environment, SE-100 44 Stockholm, Sweden)

  • Arne Lowden

    (Stress Research Institute at the Department of Psychology, Stockholm University, SE-106 91 Stockholm, Sweden)

  • Roberto Bresin

    (Media Technology and Interaction Design, KTH Royal Institute of Technology, EECS School of Electrical Engineering and Computer Science, SE-100 44 Stockholm, Sweden)

  • Jan Ejhed

    (Lighting Design Division, KTH Royal Institute of Technology, ABE School of Architecture and Built Environment, SE-100 44 Stockholm, Sweden)

Abstract

Although there is a documented preference for daylighting over artificial electric lighting indoors, there are comparatively few investigations of behaviour and perception in indoor day-lit spaces at high latitudes during winter. We report a pilot study designed to examine the effects of static artificial lighting conditions (ALC) and dynamic daylighting conditions (DLC) on the behaviour and perception of two groups of participants. Each group (n = 9 for ALC and n = 8 for DLC) experienced one of the two conditions for three consecutive days, from sunrise to sunset. The main results of this study show the following: indoor light exposure in February in Stockholm can be maintained over 1000 lx only with daylight for most of the working day, a value similar to outdoor workers’ exposure in Scandinavia; these values can be over the recommended Melanopic Equivalent Daylight Illuminance threshold; and this exposure reduces sleepiness and increases amount of activity compared to a static artificial lighting condition. Mood and feeling of time passing are also affected, but we do not exactly know by which variable, either personal or group dynamics, view or variation of the lighting exposure. The small sample size does not support inferential statistics; however, these significant effects might be large enough to be of importance in practice. From a sustainability point of view, daylighting can benefit energy saving strategies and well-being, even in the Scandinavian winter.

Suggested Citation

  • Federico Favero & Arne Lowden & Roberto Bresin & Jan Ejhed, 2023. "Study of the Effects of Daylighting and Artificial Lighting at 59° Latitude on Mental States, Behaviour and Perception," Sustainability, MDPI, vol. 15(2), pages 1-21, January.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:2:p:1144-:d:1028197
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    References listed on IDEAS

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    1. Tara A. LeGates & Cara M. Altimus & Hui Wang & Hey-Kyoung Lee & Sunggu Yang & Haiqing Zhao & Alfredo Kirkwood & E. Todd Weber & Samer Hattar, 2012. "Aberrant light directly impairs mood and learning through melanopsin-expressing neurons," Nature, Nature, vol. 491(7425), pages 594-598, November.
    2. Charles A. Czeisler, 2013. "Perspective: Casting light on sleep deficiency," Nature, Nature, vol. 497(7450), pages 13-13, May.
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