Assessment of Discomfort Glare from Daylight with High Dynamic Range (HDR) Imaging Technique: A Field Study
(0) Lighting conditions in buildings are one of the most important factors affecting building occupants comfort and well-being. While it is commonly agreed that day lighting strategies have significant potential to produce better quality work environments, fundamental issues about glare from daylight have not been settled among lighting researchers. This is due partly from the lack of fast and easy method to document luminance distribution characteristics in space, especially in the field study of glare assessment. This paper describes results from a field study on the assessment of discomfort glare from daylight. In this study, luminance distribution characteristics of actual daylit office spaces were captured using the recently-developed High Dynamic Range Imaging (HDR) technique. The study is divided into two major parts. The first part involves calibration of the HDR imaging equipment and software. The second part is the field study in which several components of the basic glare formula, luminance ratio within the field of view, and vertical solar radiation measured at window were monitored and correlated with the subjective sensation of discomfort glare. The results support the hypothesis that the sensation of discomfort increases as the magnitude of each physical environmental predictor increases. The magnitude of discomfort sensation (Ψ) was found to increase as a power function of the magnitudes of various stimuli (φ) with small to medium-sized correlation (r = 0,26-0,53, p＜,05). The results suggest that these luminance variables could potentially be used as discomfort glare predictors as an alternative to the existing Daylight Glare Index (DGI). The advantage of the HDR as a method to document luminance characteristics are also discussed in this paper.
Discomfort Glare Daylight Glare Visual Comfort High Dynamic Range
Inkarojrit, Vorapat
Department of Architecture, Faculty of Architecture, Chulalongkorn University, Phaya Thai Road, Patumwan, Bangkok 10330 Thailand
国际会议
26th Session of the CIE(国际照明委员会（CIE）第26届大会)
北京
英文
566-569
2007-07-04（万方平台首次上网日期，不代表论文的发表时间）