Stimulus range bias leads to different settings when using luminance adjustment to evaluate discomfort due to glare

Kent, Michael; Fotios, S.; Cheung, T.

Abstract

Luminance adjustment is widely used to evaluate discomfort due to glare. This paper reports an experiment conducted to investigate two factors of the luminance adjustment procedure, stimulus range bias and direct vs indirect control. Stimulus range bias describes the influence on subjective evaluations of the range of stimuli available to the test observer, with range being the minimum and maximum available glare source luminance in the current context. For the glare source, an artificial window, there were three ranges, having maximum luminances of 5 106, 7 288 and 9 469 cd/m 2. The results suggest that luminance range had a significant effect on settings made, sufficient to change settings by an amount equivalent to one step of a Hopkinson-like discomfort sensation scale. The mean luminance associated with just intolerable discomfort with the low range was less than that associated with just uncomfortable with the high range. Past experiments have used direct control, where the observer makes the adjustment directly, and indirect control, where the observer instructs the experimenter to make the adjustment actions. Both methods were used in the current experiment. It was found that range bias was larger when using direct control than with indirect control. These findings contribute to an understanding of why different studies of discomfort glare have reported different results and hence proposed different discomfort models.

Citation

Kent, M., Fotios, S., & Cheung, T. (2019). Stimulus range bias leads to different settings when using luminance adjustment to evaluate discomfort due to glare. Building and Environment, 153, 281-287. https://doi.org/10.1016/j.buildenv.2018.12.061

• Journal Article Type: Article
• Acceptance Date: Jan 16, 2019
• Online Publication Date: Mar 5, 2019
• Publication Date: 2019-04
• Deposit Date: Jan 29, 2019
• Publicly Available Date: Mar 13, 2019
• Journal: Building and Environment
• Print ISSN: 0360-1323
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 153
• Pages: 281-287
• DOI: https://doi.org/10.1016/j.buildenv.2018.12.061
• Keywords: Stimulus range bias; Discomfort glare; Adjustment procedure 2
• Public URL: https://nottingham-repository.worktribe.com/output/1503754
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S0360132318308199
• Additional Information: This article is maintained by: Elsevier; Article Title: Stimulus range bias leads to different settings when using luminance adjustment to evaluate discomfort due to glare; Journal Title: Building and Environment; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.buildenv.2018.12.061; Content Type: article; Copyright: Crown Copyright © 2019 Published by Elsevier Ltd.