Influence of background luminance on UGR result

Skoda, Jan; Sumec, Stanislav; Baxant, Petr; Motyčka, Martin

doi:10.1109/lumenv.2016.7745511

Cited by 2 publications

(1 citation statement)

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“…It is a consensus agreed upon that glare problem could be predicted and calculated by Unified Glare Rating (UGR), one of the main methodologies, which evaluated the luminance relationship between the watching target and surrounding environment. Jan Skoda et al [19] described UGR measurement with luminance analyzer and discusses overall impact of background luminance on the calculation result. Jin Yang et al [20] investigated the change of various indicators that reflect people's attention and visual fatigue under different indoor lighting conditions.…”

Section: Introductionmentioning

confidence: 99%

Assessment the Visual Clarity of the Projector in Classroom and Innovative Asymmetric Distribution LED Tube Applications

Liu

Hsiao

et al. 2021

Applied Sciences

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The paper aims to explore the relationship between the vertical plane luminance on projection screens and human visual clarity in the classroom or meeting room. While controlling the lighting environment conditions of the classroom to create different luminous distributions and luminance on the projection screen, a survey is conducted to understand students’ visual experience about screen clarity during the field experiment. The luminance of each picture on the projection screen is measured under the specified lighting conditions of luminaires in the classroom, and the relationship is formulated between the average luminance on the projection screen and the visual satisfaction based on clarity of experience. This will be useful for further studying the acceptable threshold of luminance distribution in the classroom to provide a better visual clarity and lighting quality of projection screens while teaching. In this study, the measurement and performance evaluation on a projection screen were carried out at a classroom in the National Taiwan University of Science and Technology (NTUST). By using an image luminance meter and analyzing the research results, we propose an improvement strategy for asymmetric luminous distribution design of LED light tube and light switch control mechanism of luminaires to resolve the inadequate luminance of the vertical projection screen area to improve the lighting quality and visual clarity of the projection screen while teaching with the least cost.

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Section: Introductionmentioning

confidence: 99%