Bedocs L

Brandston HM

C Cuttle

Committee of European Standards

Cuttle C

Fechner GT

Fotios S

Hurvich LM

J Duff

K Kelly

Loe D

Macrae I

Mansfield KP

Rea MS

Society of Light and Lighting

The Society of Light and Lighting

Venning B

Wilde MB

 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. </jats:p

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Lighting Research & Technology

Spatial brightness, horizontal illuminance and mean room surface exitance in a lighting booth

Spatial brightness, horizontal illuminance and mean room surface exitance in a lighting booth

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