Glare and Mounting Height of High Beams Used as Daytime Running Lamps

摘要

This analytical study examined the effects of mounting height on discomfort glarefrom reduced-power high-beam daytime running lamps. Of interest were the effects for mounting heights between 0.864 m (34 in) and 1.372 m (54 in)-the range in which full-power low beams are currently allowed, but reduced-power high beams are not. There analyses were performed. The first analysis involved estimating the illuminance reaching a preceding driver via rearview mirrors. The second analysis compared glare illuminance from reduced-power high beams to that from full-power low beams. The third analysis evaluated the expected changes in discomfort-glare ratings from reduced-power high beams as a function of increased mounting height. The analyses were based on photometric information from 5 high beams and 43 low beams, and they were performed for 5 following distances and 3 lateral offsets of the vehicles.