Ceiling-based luminance measurements: a feasible solution?

Thijs Kruisselbrink, Rajendra Dangol, Evert van Loenen

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademic

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Luminance distributions would be very suitable as input for lighting control systems that aim for
a comfortable lit indoor environment. Luminance distribution measurements should then
correspond to the visual field of the user. However, this will interfere with office activities.
Therefore, this study aims to validate whether it is feasible to approximate the luminous
conditions experienced by the user using ceiling-based measurements instead. The average
desktop luminance was measured using a luminance camera, under varying conditions,
simultaneously from eye level and ceiling and their relations were analysed. Normalized root
mean square errors were found ranging from 10,3 % to 14,3 %, while the average bias was
14,2 % between measurements from eye level and ceiling. Based on these results, it is
concluded that the experienced desktop luminance cannot be exactly replicated by ceilingbased
measurements. However, ceiling-based luminance measurements are able to provide a
reasonable approximation that suffices for practical systems.
Keywords: Luminance Camera, Field of View, HDR, Ceiling-based, Luminance distribution,
Desktop luminance, Unobtrusive measurements
Original languageEnglish
Title of host publicationProceedings of the 29th session of the CIE
Place of PublicationWashington D.C.
Publication statusPublished - 30 Jun 2019
Event29th CIE SESSION - Washington, United States
Duration: 14 Jun 201922 Jun 2019


Conference29th CIE SESSION
Country/TerritoryUnited States


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