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

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

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


Authors

Michael Kent

S. Fotios

T. Cheung



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.

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