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Perception of glare in relation to the CIE scale on Unified Glare Rating (UGR) and the impact of ambient light on both UGR and Subjective Glare Index Scales (SGI)

Ekim Olsson, Zeynep LU orcid ; Govén, Tommy and Laike, Thorbjörn LU (2023) The 30th Quadrennial Session of the CIE
Abstract
Today the Unified Glare Rating (UGR) tabular method according to CIE 117-195 and CIE 190-210 is practically the only one used for evaluation of discomfort glare in the lighting design process but it is unknown if the method is in line with the subjective perception of glare (SGI). We investigated whether UGR calculation method currently used in lighting design is in agreement with the perceived discomfort glare from commonly used lighting systems for workplaces to estimate the degree of discomfort. Five different lighting scenarios were evaluated by 59 subjects with repeated and non-repeated experiments. Analyses indicated that commonly used SGI measurements were not consistent with UGR values and discomfort glare can better be evaluated... (More)
Today the Unified Glare Rating (UGR) tabular method according to CIE 117-195 and CIE 190-210 is practically the only one used for evaluation of discomfort glare in the lighting design process but it is unknown if the method is in line with the subjective perception of glare (SGI). We investigated whether UGR calculation method currently used in lighting design is in agreement with the perceived discomfort glare from commonly used lighting systems for workplaces to estimate the degree of discomfort. Five different lighting scenarios were evaluated by 59 subjects with repeated and non-repeated experiments. Analyses indicated that commonly used SGI measurements were not consistent with UGR values and discomfort glare can better be evaluated with comfort and discomfort experiences. The knowledge contributes to understanding perceived discomfort glare and underlying factors affecting this phenomenon. (Less)
Please use this url to cite or link to this publication:
author
; and
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Glare, Unified glare rating, Ambient light, LED, CIE, Experimental design
host publication
Proceedings of the 30th Session of the CIE
pages
11 pages
conference name
The 30th Quadrennial Session of the CIE
conference location
Ljubljana, Slovenia
conference dates
2023-09-15 - 2023-09-23
ISBN
978-3-902842-77-0
DOI
10.25039/x50.2023.OP046
project
Impact of glare in common LED-based lighting systems – An evaluation
language
English
LU publication?
yes
id
658b9c5c-8059-47f1-b13a-d24d01b7cd37
date added to LUP
2023-11-15 14:28:12
date last changed
2025-09-02 11:16:06
@inproceedings{658b9c5c-8059-47f1-b13a-d24d01b7cd37,
  abstract     = {{Today the Unified Glare Rating (UGR) tabular method according to CIE 117-195 and CIE 190-210 is practically the only one used for evaluation of discomfort glare in the lighting design process but it is unknown if the method is in line with the subjective perception of glare (SGI). We investigated whether UGR calculation method currently used in lighting design is in agreement with the perceived discomfort glare from commonly used lighting systems for workplaces to estimate the degree of discomfort. Five different lighting scenarios were evaluated by 59 subjects with repeated and non-repeated experiments. Analyses indicated that commonly used SGI measurements were not consistent with UGR values and discomfort glare can better be evaluated with comfort and discomfort experiences. The knowledge contributes to understanding perceived discomfort glare and underlying factors affecting this phenomenon.}},
  author       = {{Ekim Olsson, Zeynep and Govén, Tommy and Laike, Thorbjörn}},
  booktitle    = {{Proceedings of the 30th Session of the CIE}},
  isbn         = {{978-3-902842-77-0}},
  keywords     = {{Glare; Unified glare rating; Ambient light; LED; CIE; Experimental design}},
  language     = {{eng}},
  title        = {{Perception of glare in relation to the CIE scale on Unified Glare Rating (UGR) and the impact of ambient light on both UGR and Subjective Glare Index Scales (SGI)}},
  url          = {{http://dx.doi.org/10.25039/x50.2023.OP046}},
  doi          = {{10.25039/x50.2023.OP046}},
  year         = {{2023}},
}