Visual Comfort for Motorists - Road Lighting: Fundamentals, Technology and Application - page 56

For new studies it is interesting to note that Vos ( 2003 ) has shown that there are
large qualitative and quantitative similarities between the discomfort glare concept
used for indoor lighting (unified glare ratio UGR) and that employed for road light-
ing (glare control mark G). This notwithstanding the fact that the formulas on first
sight look completely different and research for the two application fields have been
carried out totally independent from each other. Perhaps this should be a reason for
developing more common glare evaluation methods over the borders of the different
lighting application fields. The application field of automobile lighting should, of
course, be included here as well. The most widely used system of discomfort glare
prediction for automobile lighting is, already for a long time, that developed by
Schmidt-Clausen and Bindels ( 1974 ). It uses the illuminance at the eye caused by a
glare source, together with the background luminance (road surface luminance) and
the angle from the line of sight to the glare source to calculate discomfort glare in
terms of the nine-point de Boer scale.
A completely new approach towards studying glare has been proposed in which
neural activity in the brain caused by glare is mapped by means of functional magnetic
resonance imaging, or fMRI (Raynham et al. 2007 ). Perhaps such an approach may
lead in the future to an objective model for discomfort glare.
References
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