Illuminance uniformity on desks: Where is the limit?

Slater, AI; Boyce, P.R.

doi:10.1177/096032719002200401

Cited by 46 publications

(24 citation statements)

References 4 publications

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“…Slater and Boyce varied the minimum:maximum ratio between 0.2 and 0.8, but found no effect on a variety of paper-based clerical tasks. 36 They noted that this was not unexpected, because calculation based on the Rea and Ouellette relative visual performance model 20 showed that all the illuminance conditions were sufficient to see the tasks. The advent of computers in offices changed the primary task from the horizontal to the vertical plane and raised new research questions about acceptable luminance ratios between the computer screen and paper documents.…”

Section: -31mentioning

confidence: 96%

Lighting Quality Contributions from Biopsychological Processes

Veitch

2001

Journal of the Illuminating Engineering Society

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. Society, 30, 1, pp. 3-16, 2001-04-01 Lighting quality contributions from biopsychological processes Veitch, J. A. Journal of the Illuminating Engineering Lighting quality contributions from biopsychological processes Veitch, J.A.A version of this paper is published in / Une version de ce document se trouve dans :Journal of the Illuminating Engineering Society, v. 30, no. 1, 2001, pp. 3-16 www.nrc.ca/irc/ircpubs NRCC-42468© AbstractInternal processes, both biological and psychological, are thought to mediate the relationships between luminous conditions and such behavioral outcomes as task performance, mood, social behavior, aesthetic judgements and satisfaction. This review paper summarizes the state of knowledge concerning mediating biopsychological processes: visibility, photobiology, and stress and arousal. Visibility is well-understood and obviously relevant to lighting practice. Photobiology, however, is a new entrant to the realm of lighting research; its findings could have important implications for recommended illuminance levels if these were based on more than visibility. Stress and arousal, interrelated concepts, are popular notions, but close examination reveals only weak support for these mechanisms as explanations of lighting effects on behavior. The improved organization of research and increased predictive power that would result from clear exposition of theoretical mechanisms in lighting research holds promise for progress in linking research and application.Lighting Quality and Biopsychology / 2 Introduction Renewed interest in lighting quality emerged in the early 1990s, in parallel with the development of energy codes and standards. Lighting practitioners remembered the energy conservation strategies of the 1970s energy crisis, in which delamping reduced overall light levels and produced uneven distributions of light. Energy was saved, but lighting quality declined. Lighting designers of the day decried this simplistic approach to conservation and feared that similar strategies would occur again.1-3 Committees were struck by the major associations, and many conference sessions on lighting quality were convened.The definition of lighting quality most widely adopted in these discussions has been an emergent one, in which lighting quality is the degree of excellence achieved, in terms of meeting human needs 4 and integration of these outcomes with energy conservation and architecture.5 Veitch and Newsham...

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Section: -31mentioning

confidence: 96%

Lighting Quality Contributions from Biopsychological Processes

Veitch

2001

Journal of the Illuminating Engineering Society

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“…As far as threshold values are concerned, a list of some recommended uniformity ratios (table 3) is provided in [90] and reported in [91]. though the entity of such 'compensation' is not quantified.…”

Section: Illuminance Uniformitymentioning

confidence: 99%

A review of indices for assessing visual comfort with a view to their use in optimization processes to support building integrated design

Carlucci

Causone

Rosa

et al. 2015

Renewable and Sustainable Energy Reviews

335

156

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In the last decades, several studies aimed at assessing some specified aspects of visual comfort characterizing the relationship between the human needs and the light environment, such as an available amount of light, light uniformity, light quality in rendering colors, and predicting the risk of glare for space occupants. For each of them, a (still growing) number of indices and metrics have been proposed in literature and standards. In the present work, they are described, categorized according to common features, and finally discussed. As in the case of long-term thermal comfort indices, such visual comfort indices and their summation over a specified calculation period might be used for driving optimization processes to support a more conscious integrated design of buildings. To that purpose, the choice among the available visual comfort indices needs to be informed by an analysis of their features and implications. We present recommendations for use, and suggest areas where improvement is needed for their use in optimization processes to support buildings' design.

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“…Slater and Boyce asked participants to rate the evenness of the lighting, its acceptability, and its comfort, in relation to various illuminance ratios across a desktop task (task performance was also measured, but did not vary in relation to uniformity). 90 They concluded that for tasks that are primarily in the center of the desk, illuminance ratios as low as 0.5 would be acceptable for most people. Similarly, rankings of five luminous conditions with several measures of visual comfort were not related to the illuminance uniformity across the desk surface.…”

Section: Affectmentioning

confidence: 99%

Psychological Processes Influencing Lighting Quality

Veitch

2001

Journal of the Illuminating Engineering Society

155

104

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. Society, 30, 1, pp. 124-140, 2001-04-01 Psychological processes influencing lighting quality Veitch, J. A. Journal of the Illuminating Engineering Psychological processes influencing lighting quality Veitch, J.A.A version of this paper is published in / Une version de ce document se trouve dans :Journal of the Illuminating Engineering Society, v. 30, no. 1, 2001, pp. 124-140 www.nrc.ca/irc/ircpubs NRCC-42469 AbstractVeitch and Newsham proposed a behaviorally-based model for lighting quality research, in which individually-based processes mediate the relationships between luminous conditions and such behavioral outcomes as task performance, mood, social behavior, aesthetic judgements and satisfaction. This review paper summarizes the state of knowledge concerning mediating psychological processes: perceived control, attention, environmental appraisal, and affect. These processes were selected because of their relevance to the explanations often given for lighting design choices.More explicit use of theoretically-driven predictions to guide lighting research would result in greater precision in our comprehension of lighting-behavior relationships to form the foundation of empirically-based lighting recommended practice.Psychology and Lighting Quality / 2 Introduction Surveys of office employees consistently report that lighting is among the more important features of office design and furnishings.1,2 Likewise, in the professional community of lighting designers and illuminating engineers, there is a long history of speculation that the quality of the luminous environment can influence task performance, comfort, and well-being, 3,4 effects that are fundamentally psychological --that is, behavioral, in nature. This paper reviews the relevant literature concerning such effects, in an attempt to provide direction for lighting recommended practice and to further lighting quality research.Stein, Reynolds, and McGuinness once defined lighting quality as "a term used to describe all of the factors in a lighting installation not directly connected with quantity of illumination." (5, p.887) Their definition, although flexible enough to be applied to a wide variety of lit environments, offers little guidance concerning how to measure the quality of a lit environment. Veitch and Newsham proposed that lighting quality exists when the luminous conditions support the behavioral needs of individuals in the lit space.6 This definition has...

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Illuminance uniformity on desks: Where is the limit?

Cited by 46 publications

References 4 publications

Lighting Quality Contributions from Biopsychological Processes

Lighting Quality Contributions from Biopsychological Processes

A review of indices for assessing visual comfort with a view to their use in optimization processes to support building integrated design

Psychological Processes Influencing Lighting Quality

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