CIE x048-OP52 PDF

ILLUMINANCE AT THE EYE AS A SIMPLE METRIC FOR DISCOMFORT GLARE FROM PEDESTRIAN SCALE LUMINAIRES

CIE x048-OP52 – ILLUMINANCE AT THE EYE AS A SIMPLE METRIC FOR DISCOMFORT GLARE FROM PEDESTRIAN SCALE LUMINAIRES

In outdoor environments after dark, pedestrians may experience discomfort from road lighting. Previous studies have therefore developed models to predict discomfort from glare in pedestrian applications. However, the performance of these models has not been comprehensively assessed, and measurement challenges arise in field evaluations. This paper evaluates the performance of a model proposed by Bullough et al (2008) and compares it to prediction using only direct illuminance at the eye. Diagnostic metric tests were conducted using three independent datasets from previously published studies. The results suggested that direct illuminance at the eye performed similarly to the Bullough et al. model over the range of lighting conditions examined. These conditions included one glare source that contributed between 4 lx – 82 lx, and a low contribution from indirect illuminance and other lighting installations 1 lx – 4 lx. Further studies are needed to examine the importance of incorporating indirect illuminance from source and ambient illuminance for predicting discomfort glare.