Discomfort Glare Cut-off Values from Field and Laboratory Studies

C. Pierson, M. Sarey Khanie, M. Bodart, J. Wienold

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


For the application of discomfort glare metrics, a categorisation is used, dividing the metric scale into categories of perception. These categories are separated by borderline values, or so-called cut-off values. Recent literature shows that these cut-off values are lower when they are derived from field study data than those derived from laboratory study data. To investigate this further, the data from one field study and two laboratory studies was used to derive and compare cut-off values corresponding to three borderlines. The results show that the field study cut-off values were systematically lower than the laboratory study ones, implying that discomfort glare is reported at lower stimulus magnitudes in the field. Although further research is required on that topic, several hypotheses are discussed in order to explain the gap between cut-off values derived from field data and cut-off values derived from laboratory data.
Recommendations for future studies are also provided.
Original languageEnglish
Title of host publicationProceedings of the 29th CIE SESSION
Number of pages10
PublisherCIE Commision Internationale de L'eclairage
Publication date2019
Publication statusPublished - 2019
EventCIE 2019 29th Quadrennial Session - Washington DC, United States
Duration: 14 Jun 201922 Jun 2019


ConferenceCIE 2019 29th Quadrennial Session
Country/TerritoryUnited States
CityWashington DC
Internet address


  • Daylight
  • Discomfort glare
  • Cut-off value
  • Laboratory study
  • Field study


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