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research article

Comparing performance of discomfort glare metrics in high and low adaptation levels

Quek, Geraldine  
•
Wienold, Jan  
•
Sarey Khanie, Mandana  
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December 1, 2021
Building and Environment

Current discomfort glare prediction metrics usually account for at least one of the two categories of effects that induce discomfort glare – the saturation and contrast effects. Saturation-driven metrics (overall illuminance on the eye) are suited for brightly lit scenes in general. On the contrary, contrast-driven metrics (luminance ratio in the field of view) usually perform better in high contrast conditions such as with small-sized bright glare sources. Only a few existing metrics consider both effects, such as the Daylight Glare Probability (DGP). However, even these “hybrid” metrics may underperform in conditions other than those considered when they were developed, such as in dim scenes with high contrast glare. This paper investigates the ability of current glare indicators to predict perceived discomfort glare in user-evaluated scenes depending on two different adaptation levels. Towards this end, we used a composite dataset of six laboratory studies performed previously and separately in various parts of the world. According to Receiver Operator Characteristics (ROC) findings and complementary statistical research, the hybrid metrics DGP and Eccologit perform best in both investigated ranges (dimmer and brighter scenes). For the single-effect metrics, the contrast-driven metrics appear to perform better than saturation-driven metrics in lower adaptation levels (dimmer scenes), while the reverse is seen in higher adaptation levels (brighter scenes). As a result, metrics that only consider one effect should be used with caution. Although hybrid metrics continue to perform well in the investigated scenes, further research is needed to extend their applicability to a larger variety of lighting conditions that may be observed in work environments.

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Type
research article
DOI
10.1016/j.buildenv.2021.108335
Author(s)
Quek, Geraldine  
Wienold, Jan  
Sarey Khanie, Mandana  
Erell, Evyatar
Kaftan, Eran
Tzempelikos, Athanasios
Konstantzos, Iason
Christoffersen, Jens
Kuhn, Tilmann
Andersen, Marilyne  
Date Issued

2021-12-01

Published in
Building and Environment
Volume

206

Article Number

108335

Subjects

Glare

•

Discomfort glare

•

Glare metrics

•

Saturation

•

Contrast

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LIPID  
Available on Infoscience
October 4, 2021
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/181833
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