Relative Importance of Horizontal and Vertical Aim of Low-Beam Headlamps

摘要

The study evaluated the relative effects of horizontal and vertical misaim of low-beam headlamps. The approach involved analyzing light-output matrices of 150 production low beams, manufactured for sale in the U.S., Europe, and Japan. The specific analysis involved computing, for 225 locations in the central part of each beam pattern, the ratios of nominal intensity to intensity for horizontal and vertical misaim of up to 1.5 deg. The resultant intensity ratios were then interpreted in terms of their likely effects on visual performance and discomfort glare. Simultaneous horizontal and vertical misaim were not considered.