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 candlepower distribution, fixture spacing, and illuminance level. Three representative luminaires were parametrically examined: a lensed troffer, a high-performance parabolic, and a high-performance uplight. Small differences in average task visibility levels were observed for the different luminaires and fixture spacings examined, but these differences were slight compared with variability within an installation. The study indicates that if 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.
BT - IEEE-IAS Annual Conference C1 -Lighting Systems Group
C2 - LBL-30178 CN - LBL-30178 CY - San Diego, CA DA - 10/1989 LA - eng N2 -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 candlepower distribution, fixture spacing, and illuminance level. Three representative luminaires were parametrically examined: a lensed troffer, a high-performance parabolic, and a high-performance uplight. Small differences in average task visibility levels were observed for the different luminaires and fixture spacings examined, but these differences were slight compared with variability within an installation. The study indicates that if 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.
PP - San Diego, CA PY - 1989 T2 - IEEE-IAS Annual Conference T3 - IEEE-IAS Annual Conference TI - The Effect of Luminaire Type and Spacing on Visibility Levels in Unobstructed Spaces ER -