Circadian lighting in a space daylit by a tubular daylight device

4th Asia Conference of International Building Performance Simulation Association

土木建筑工程

Jain, Sneha^1 ; Fernandes, Luis^2 ; Regnier, Cynthia^2 ; Garg, Vishal^1

International Institute of Information Technology, Hyderabad, India^1

Lawrence Berkeley National Lab, CA, United States^2

关键词: Built environment;    Circadian rhythms;    Color temperatures;    Correlated color temperature;    Daily variations;    High dynamic range images;    Spectral composition;    State-of-the-art techniques;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/238/1/012030/pdf
DOI  :  10.1088/1755-1315/238/1/012030

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

This study demonstrates an experimental example of application of time-lapse high dynamic range images for analyzing variations in correlated color temperature (CCT) and circadian lighting in an interior space daylit using a tubular daylight device (TDD). Previous studies have shown that the spectral composition of daylight affects human circadian rhythms, with emphasis on wavelengths towards the blue region of the visible spectrum. Spectrally based metrics such as CCT can therefore aid in evaluating the circadian impact of daylight. TDDs redirect daylight towards interior spaces with changing light levels and color temperatures during the daylight hours. This paper details the color temperature and circadian lighting metrics (circadian luminance and illuminance) in an interior space throughout a period of several days in a mid-latitude, temperate, sunny climate. An automated time-lapse HDR photography apparatus was modified to allow for calculation of CCT and circadian lighting metrics using state-of-the art techniques available in the literature. Prior to the measurements in the space with the TDD, this device was calibrated against a spectrophotometer. Results indicate the level of daily variation in CCT and circadian lighting metrics that can be expected in interior spaces daylit by TDDs without any other sources of daylight. Besides showcasing the use of HDR techniques, these results could be used to support design decisions involving daylighting in interior spaces. These techniques can also be used outside the laboratory in the evaluation of the circadian impact of lighting throughout the built environment.