Spatial brightness, horizontal illuminance and mean room surface exitance in a lighting booth. (February 2017)

• Record Type: Journal Article
• Authors: Duff, J; Kelly, K; Cuttle, C
• Is Part Of: Lighting research & technology. Volume 49:Number 1(2017)
• Page Start: 5
• Page End: 15
• Publication Date: 2017-02
• Subjects: Lighting -- Periodicals; 621.32
• DOI: 10.1177/1477153515597733
• Languages: English
• ISSNs: 1477-1535

Abstract

This paper presents a pilot study that has investigated the suitability of mean room surface exitance as a predictor of spatial brightness and compared these results with how horizontal illuminance predicts spatial brightness under the same conditions. The experiment took a group of 26 participants and, using a scaled booth, exposed each participant to three levels of mean room surface exitance, each delivered with three different light distributions and three different surface reflectances, resulting in a total of 27 light scenes. Results demonstrated that, under the range of conditions to which participants were exposed, a systematic relationship existed between mean room surface exitance and spatial brightness, but not between horizontal illuminance and spatial brightness.