Discomfort glare evaluation: the influence of anchor bias in luminance adjustments

Kent, M.G. and Fotios, S. and Altomonte, Sergio (2017) Discomfort glare evaluation: the influence of anchor bias in luminance adjustments. Lighting Research and Technology . ISSN 1477-0938

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Abstract

Luminance adjustment is a procedure commonly used to evaluate discomfort glare and the results from adjustment experiments form the basis of some recommendations for limiting its occurrence. There are, however, strong reasons to expect that settings made using adjustment are unintentionally influenced by extraneous variables. This paper discusses bias towards the initial anchor, the setting of the variable stimulus immediately before an adjustment is made. Specifically, the initial luminance is expected to influence the setting that is made by adjustment; for example, a lower initial luminance leads to a lower setting than a high initial luminance. To investigate anchor bias, a Hopkinson-like multiple-criterion adjustment experiment was undertaken, but with three different anchors. The results confirmed significant bias: glare settings were biased towards the luminance of the initial anchor. This demonstrates a need for caution when using adjustment to explore discomfort glare and when interpreting the results of past studies that used discomfort glare models fitted to data obtained with this procedure.

Item Type: Article
Schools/Departments: University of Nottingham, UK > Faculty of Engineering > Department of Architecture and Built Environment
Identification Number: 10.1177/1477153517734280
Depositing User: Eprints, Support
Date Deposited: 06 Nov 2017 09:40
Last Modified: 06 Nov 2017 20:00
URI: http://eprints.nottingham.ac.uk/id/eprint/47839

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