Effect of different coloured luminous surrounds on LED discomfort glare perception

Hickcox, Kathryn Sweater; Narendran, Nadarajah; Bullough, John D.; Freyssinier, Jean Paul

doi:10.1177/1477153512474450

Cited by 24 publications

(15 citation statements)

References 10 publications

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“…Several studies have looked into the factors affecting the perceived quality of nighttime illumination by pedestrians [7,[13][14][15][16][17][18][19][20][21][22][23][24]. However, most of these studies were performed in laboratory conditions, which cannot realistically reflect the complexity of outdoor environmental factors (e.g., time, weather, vegetation density and terrain), thus potentially causing biases in the information collected.…”

Section: Introductionmentioning

confidence: 99%

Linking nighttime outdoor lighting attributes to pedestrians' feeling of safety: An interactive survey approach

et al. 2020

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Public space lighting (PSL) contributes to pedestrians’ feeling of safety (FoS) in urban areas after natural dark. However, little is known how different PSL attributes, such as illuminance, light temperature, uniformity and glare, affect people's FoS in different contextual settings. The present study aims to bridge this knowledge gap by developing a model linking different PSL attributes with FoS, while controlling for individual, locational, environmental and temporal factors. To develop such model, the study employs a novel interactive user-oriented method, based on a specially-designed mobile phone application–CityLightsTM. Using this app, a representative sample of observers reported their impressions of PSL attributes and FoS in three cities in Israel, following a set of predetermined routes and points. As the study shows, higher levels of illumination and uniformity positively affect FoS, while lights perceived as warm tend to generate higher FoS than lights perceived as cold. These findings may guide future illumination polices aimed at promoting energy efficiency while ensuring urban sustainability.

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Section: Introductionmentioning

confidence: 99%

Linking nighttime outdoor lighting attributes to pedestrians' feeling of safety: An interactive survey approach

et al. 2020

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“…As for the interaction between the glare source luminance and background luminance, an assumption could be based on the general expression of glare sensation shown in Eq. (1). Referring to this model, we assumed that the deBoer rating R deBoer was related to the logarithm of a combined variable containing the glare source luminance (L g ) and the background luminance (L b ) as shown in Eq.…”

Section: Alternative Variablesmentioning

confidence: 99%

“…These developments enable the penetration of LED technology into the general lighting market. However, this kind of new light sources possesses the characteristics of high surface luminance, small emitting size and special spectral power distribution due to its peculiar emitting principle, in outdoor lighting, and especially in road lighting, there is also a rising concern that LED based light sources may cause more glare to drivers and pedestrians [1].Since glare increases the detection threshold of objects' motion nearby [2] and decreases the luminance contrast between objects and their background, it is considered a severe issue for traffic safety. The method of glare control is becoming a hot topic in the evaluation of the lighting quality again as the widespread applications of the LEDs.…”

Section: Introductionmentioning

confidence: 99%

Model predicting discomfort glare caused by LED road lights

Lin¹,

Liu²,

Sun³

et al. 2014

Opt. Express

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Abstract:To model discomfort glare from LED road lighting, the effect of four key variables on perceived glare was explored. These variables were: the average glare source luminance (L g ), the background luminance (L b ), the solid angle of the glare source from the perspective of the viewer (ω) and the angle between the glare source and the line of sight (θ). Based on these four variables 72 different light conditions were simulated in a scaled experimental set-up. Participants were requested to judge the perceived discomfort glare of these light conditions using the deBoer rating scale. All four variables and some of their interactions had indeed a significant effect on the deBoer rating. Based on these findings, we developed a model, and tested its general applicability in various verification experiments, including laboratory conditions as well as real road conditions. This verification proved the validity of the model with a correlation between measured and predicted values as high as 0.87 and a residual deviation of about 1 unit on the deBoer rating scale. These results filled the gap in estimating discomfort glare of LED road lighting and clarified similarities of and differences in discomfort glare between LED and traditional light sources.

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“…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. [35].…”

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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Effect of different coloured luminous surrounds on LED discomfort glare perception

Cited by 24 publications

References 10 publications

Linking nighttime outdoor lighting attributes to pedestrians' feeling of safety: An interactive survey approach

Linking nighttime outdoor lighting attributes to pedestrians' feeling of safety: An interactive survey approach

Model predicting discomfort glare caused by LED road lights

Glare assessment for research and development of measurement methods

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