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Room lighting in the absence of a defined visual task and the impact of mean room surface exitance

Raynham, P; (2016) Room lighting in the absence of a defined visual task and the impact of mean room surface exitance. Lighting Research & Technology , 48 (2) pp. 190-204. 10.1177/1477153514561071. Green open access

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Abstract

With conditions for lighting design changing it is becoming important to consider what to do in rooms where there is no particular visual task. The current European standard for lighting in work places gives a number of requirements for room lighting, the most onerous being the requirement for cylindrical illuminance. Mean room surface exitance (MRSE) has been put forward as a metric that is a good predictor of perceived adequacy of illumination. The paper examines the consequences of adopting a proposed MRSE target of 100 lumens per square metre in two sizes of room with a variety of surface reflectances and lit by a regular array of light sources with a range of light distributions. The paper concludes that significant extra luminous flux will be required to meet the new MRSE target and that light distributions with a significant upward component will also be needed.

Type: Article
Title: Room lighting in the absence of a defined visual task and the impact of mean room surface exitance
Open access status: An open access version is available from UCL Discovery
DOI: 10.1177/1477153514561071
Publisher version: http://doi.org/10.1177/1477153514561071
Language: English
Additional information: © The Chartered Institution of Building Services Engineers 2014. This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of the Built Environment
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of the Built Environment > Bartlett School Env, Energy and Resources
URI: https://discovery.ucl.ac.uk/id/eprint/10040548
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