The effect of luminaire type and spacing on visibility levels in unobstructed spaces
- Lighting Systems Research Group, Applied Science Div., Lawrence Berkeley Lab., Berkeley, CA (US)
The study examines how luminaire type and spacing affect task contrast and visibility in unobstructed office spaces. The Lumen-Micro program was used to calculate visibility levels in a model open-office space as a function of luminaire candle power distribution, fixture spacing, and illuminance level. Three representative luminaries were parametrically examine: a lensed troffer, a high-performance parabolic, and a high-performance uplight. Small differences in average task visibility levels were observed for the different luminaries and fixture spacings examined, but these differences were slight compared with variability within an installation. This paper reports that the study indicates that is one does not know the location of the task a priori, then it is not possible to achieve consistently high visibility levels throughout a space without resorting to lighting solutions that are intrinsically inefficient.
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 5346754
- Journal Information:
- IEEE Transactions on Industry Applications (Institute of Electrical and Electronics Engineers); (United States), Vol. 27:4; ISSN 0093-9994
- Country of Publication:
- United States
- Language:
- English
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