Investigation of existing discomfort glare indices using human subject study data

Suk, Jae Yong; Schiler, Marc; Kensek, Karen

doi:10.1016/j.buildenv.2016.09.018

Cited by 90 publications

(45 citation statements)

References 10 publications

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“…The luminaire above each participant did not have such shields because it was not in the participant's field-of-view. Although the UGR was ≤19 in all conditions, this extra precautionary measure was taken because when extreme luminances occur in the field of view, they might feel uncomfortable; nevertheless, participants in the study by de Bakker et al 2018disliked the brightest condition the least, and research showed that indices are limited in estimating human perceptions (Suk et al 2017). This discomfort might consequently dominate their general perception of the lighting and hence prevent them from setting their real preferred luminances.…”

Section: Settingsmentioning

confidence: 99%

Preferred luminance distributions in open-plan offices in relation to time-of-day and subjective alertness

Bakker

Aarts

Kort

et al. 2019

LEUKOS

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Dynamic lighting is one of the new trends in lighting research; providing the right lighting level at the right time could possibly increase the alertness and performance of office workers. However, they might have preferences that deviate from this "healthy" lighting. Simultaneously, the building environment becomes increasingly automated, with occupancy-based control as one of the most well-known examples to reduce offices' lighting energy consumption. Nevertheless, preferences for lighting levels in the unoccupied area of the multi-occupant office space have not been addressed yet. Therefore, we studied luminance distribution preferences in relation to time of day and subjective alertness (SA) in a single occupancy scenario. Participants (N = 30) set the surrounding and background lighting six times a day as we first probed for SA. Our results clearly showed that a subset preferred varying luminance distributions; participants had fluctuating feelings of alertness, too. Preferences deviated sometimes from the typical dynamic lighting scenarios, suggesting that they do not always prefer healthy lighting. Moreover, we identified an effect of SA on the preferences, both with and without controlling for time of day. Hence, this study showed that we need to address these two factors when we want to provide satisfactory lighting conditions in case the office is not fully occupied. These are likely to affect other lighting preferences and therefore deserve more attention from research. Because we identified large individual differences, we suggest personalizing dynamic scenarios as the focus of future research.

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Section: Settingsmentioning

confidence: 99%

Preferred luminance distributions in open-plan offices in relation to time-of-day and subjective alertness

Bakker

Aarts

Kort

et al. 2019

LEUKOS

View full text Add to dashboard Cite

show abstract

“…The simplification consists of neglecting the influence of peak glare sources, and significantly reduces the computational effort [49]. The discomfort glare index (DGI) is considered less precise [55] while the measurement of glare through HDR (high dynamic range) images [29,56] is too complicated for extensive monitoring.…”

Section: Metricsmentioning

confidence: 99%

A Novel Approach for the Definition of an Integrated Visual Quality Index for Residential Buildings

2019

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Visual quality is an important component of indoor environment quality and greatly affects inhabitants’ perception of the living space. Nevertheless, the lighting design of residential buildings is usually underestimated by both designers and standards. This paper presents an integrated index for evaluating the visual quality of an indoor environment in residential buildings. The main parameters considered are daylight access, probability of glare from daylight and electric illumination, maintained illuminance, and color temperature. These aspects are evaluated throughout a whole year using a fixed set of metrics and are combined using relative weights. It was decided to also consider qualitative parameters in order to give more importance to some psychological aspects of visual comfort. Finally, the building visual quality index is obtained by a weighted average of the results of each room with the addition of the qualitative parameters. The applicability of the index was tested through the simulation of a dwelling that will be built and monitored in the context of the Comfort for Sustainable Buildings in the Alps (CASA) research project. The building visual quality index proved to be useful during the design process, allowing for improvements in both electric illumination and daylight access through a comparison of different solutions. This study could represent a step towards the holistic evaluation of indoor environment quality.

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“…A number of studies have focused on using HDR images for discomfort glare analysis from daylight, e.g., (Clear, 2012;Suk et al, 2017;Mcneil & Burrell, 2016). Existing glare assessment studies were typically based on real-world building.…”

Section: Discomfort Glare Indicesmentioning

confidence: 99%

Integrating building information modeling and virtual reality development engines for building indoor lighting design

et al. 2017

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Background: Lighting simulation tools are extending the functionality of Building Information Modeling (BIM) authoring software applications to support the lighting design analysis of buildings. Although such tools enable quantitative and qualitative analysis and visualization of indoor lighting, they do not provide an interactive environment between users and the design context. Moreover, their visualization environments do not allow users to experience visual phenomena such as glare. In addition, lighting energy consumption generated from traditional tools is often separated from the 3D virtual context of the building. Therefore, an incorrect interpretation by designers regarding the relationship between their desirable lighting design and energy feedback may occur. Methods: This research proposes a method and develops a BIM-based lighting design feedback (BLDF) prototype system for realistic visualization of lighting condition and the calculation of energy consumption. Results:The results of a case study revealed that BLDF supports design stakeholders to better perceive and optimize lighting conditions in order to achieve a higher degree of satisfaction in terms of lighting design and energy savings for future occupants. Conclusions: The developed system utilizes an interactive and immersive virtual reality (VR) environment to simulate daylighting and the illumination of artificial lights in buildings and visualizes realistic VR scenes using head mounted displays (HMD). BLDF allows users to interact with design objects, to change them, and to compare multiple design scenarios, and provides real-time lighting quality and energy consumption feedback.

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Investigation of existing discomfort glare indices using human subject study data

Cited by 90 publications

References 10 publications

Preferred luminance distributions in open-plan offices in relation to time-of-day and subjective alertness

Preferred luminance distributions in open-plan offices in relation to time-of-day and subjective alertness

A Novel Approach for the Definition of an Integrated Visual Quality Index for Residential Buildings

Integrating building information modeling and virtual reality development engines for building indoor lighting design

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