Calculation of the Unified Glare Rating based on luminance maps for uniform and non-uniform light sources

Scheir, Gertjan; Hanselaer, Peter; Bracke, P.; Ryckaert, Wouter

doi:10.1016/j.buildenv.2014.10.027

Cited by 34 publications

(17 citation statements)

References 21 publications

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“…There is also known special adjustable-size apparatus that allows obtaining diamond shape glare source with variable, controlled sizes [64]. Nowadays arrays of LEDs are often used: as a sources mounted on ceiling [38], or on the wall [35,44]. LEDs enable the easy change of color temperature [65] and simulation of uniform or non-uniform luminance of glare sources.…”

Section: Methods and Equipment Used In Research On Glarementioning

confidence: 99%

Glare assessment for research and development of measurement methods

Sawicki¹

2019

ELECTROTECHNICAL REVIEW

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Glare is one of the most important parameter of lighting quality. Despite the passage of time from the beginning of glare research, no standard of conducting laboratory experiments was proposed. In the article the review of solutions related to glare assessment is presented. The method of conducting research on glare is also described. The authors pay attention to the most important aspects in the methodology of glare assessment for the experimental research on glare and glare assessment based on UGR measurements. The tests of the new algorithm for UGR calculation is presented-algorithm for precise identification and extraction of glare source area from HDR image. Streszczenie. Olśnienie jest jednym z najważniejszych parametrów jakości oświetlenia. Pomimo upływu czasu od rozpoczęcia badań nad olśnieniem, nie zaproponowano żadnego standardu prowadzenia eksperymentów laboratoryjnych. W artykule przedstawiono przegląd rozwiązań związanych z oceną olśnienia. Została także opisana metoda prowadzenia badań nad olśnieniem. Autorzy zwracają uwagę na najważniejsze aspekty metodyki oceny olśnienia w badaniach eksperymentalnych nad olśnieniem oraz metodyki oceny olśnienia w oparciu o pomiar UGR. Przedstawiono testy nowego algorytmu wyznaczania wskaźnika UGR; algorytmu precyzyjnego wyodrębniania obszaru źródła olśnienia na obrazie HDR. (Ocena olśnienia dla badań i rozwoju metod pomiarowych).

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Section: Methods and Equipment Used In Research On Glarementioning

confidence: 99%

Glare assessment for research and development of measurement methods

Sawicki¹

2019

ELECTROTECHNICAL REVIEW

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“…The predominant model for interior lighting currently is the Unified Glare Rating (CIE 1995), but the general consensus is that most models hold only within restricted conditions or circumstances, and none of the models available are completely accurate. Recent considerations, for instance, pertain to nonuniformity of the source (e.g., Cai and Chung 2012;Donners et al 2016;Geerdinck 2012;Geerdinck et al 2014;Scheir et al 2015;Yang et al 2017) or sources that are not static (Issolio and Colombo 2006). Understanding glare caused by nonuniform and nonstatic sources is, of course, becoming more and more important given the increasing application of light emitting diode lighting.…”

Section: Visual Comfortmentioning

confidence: 99%

Tutorial: Theoretical Considerations When Planning Research on Human Factors in Lighting

Kort

2019

LEUKOS

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Research on human functioning is notoriously difficult. This particularly holds for the study of light effects, at least if one wants to go beyond establishing that changes in light "have an effect" and understand why this effect occurs-in other words, if one wants to make causal inferences about the mechanism behind it. The latter is, of course, crucial for generalizing insights and being able to use them effectively in other contexts. The culmination of many decades of research has taught us that light affects psychological functioning in numerous ways and through various pathways. This implies that, regardless of the investigator's particular interests in either of those mechanisms, generally all will be at play, simultaneously, for participants in any lighting study. The present tutorial aims to address this complexity and how to deal with it by concisely describing the most important pathways that we currently are aware of. Such awareness is important both in contemplating the design and methodology of a study and in interpreting results from other studies and generalizing them to a particular application or light design. ARTICLE HISTORY

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“…This second solution involves large lighting losses, which make them inefficient. Current studies of LED luminaires indicate that their glare effect is significantly different than the one produced by conventional technologies lamps "because of their non-uniform luminance distribution with alternating areas of high and low luminance" and conventional glare measurement indices, such as the UGR (Unified Glare Rating) of the CIE (International Comission on Illumination), are not appropriate for this latest type of light sources [19]. Thus, Liu and others [20] indicate that the most appropriate solution to avoid glare with this technology is to act with an outer diffuse optical cover to improve the lighting performance.…”

Section: Analysis Of Glare In Public Lightingmentioning

confidence: 99%

Evaluation of Uniformity and Glare Improvement with Low Energy Efficiency Losses in Street Lighting LED Luminaires Using Laser-Sintered Polyamide-Based Diffuse Covers

et al. 2018

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Energy saving in street lighting is garnering more interest and has become a priority in municipal management. Therefore, LED luminaires are gradually becoming prevalent in our cities. Beyond their energy/economic saving potential, quality in public lighting installations concerns aspects such as uniformity and glare which must be maintained if not improved in any installation renewal project using this technology. The high light intensity generated in a discrete point in LED packages and its directional nature result in significant deficiencies in these last two parameters. To soften these effects, translucent covers are being used as one of the most common solutions with the drawback of significant light intensity losses. The objective of this paper is to evaluate the behavior of LED luminaire's polyamide-based optical covers manufactured with a laser-sintered process. These are designed to improve glare and uniformity output, to minimize light output reductions, and to be industrially manufactured with no increment of cost for their lighting equipment compared to conventional transparent polycarbonate solutions. A laboratory and field lighting test study has been applied to different covers with the same LED lamp and luminaire to compare the performance of three different solutions built with different polymeric materials and with different light transmission surface textures. The photometric results have been observed and discussed to demonstrate the ability to significantly improve the lighting performance of LED luminaires-illuminance and uniformity levels and discomfort and disability glare indexes-using an improved optic cover.

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Calculation of the Unified Glare Rating based on luminance maps for uniform and non-uniform light sources

Cited by 34 publications

References 21 publications

Glare assessment for research and development of measurement methods

Glare assessment for research and development of measurement methods

Tutorial: Theoretical Considerations When Planning Research on Human Factors in Lighting

Evaluation of Uniformity and Glare Improvement with Low Energy Efficiency Losses in Street Lighting LED Luminaires Using Laser-Sintered Polyamide-Based Diffuse Covers

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