An optical design of LED automotive headlamps based on projector systemsYU Gui-ying, CHEN Xiao-li, YAO Shuai, ZHENG Ying-jun College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, ChinaAbstract:An automotine headlamp of LED based on GB4785-1998 was designed with poly-ellipsoid reflactors, shields and aspheric lens choosing a warm white LED source that contains a little of blue color. Each LED had its optical system respectively. The best focus of the poly-ellipsoid reflector＇s vertical and horizontal section ellipses was simulated. A higher beam lamp of four LED systems was constructed in the system of lower beam lamps. The photometric result accords with GB4599-94 when the lower and higher learn lamps were simulated.[著者文摘]