1　概述H4光源有一根近光灯丝和一根远光灯丝。使用H4光源的车灯一般使用非对称抛物面反射器。在光源近光灯丝的下部,有一个配光屏(参见图1,详细资料请参见国家标准中关于汽车灯用H4光源的参数要求),配光屏提供初步的15°截止线。光源发射的光经反射器反射后,再经车灯前面的配 1 Overview The H4 light source has a low-beam filament and a high-beam filament. Lights using H4 light sources generally use asymmetric parabolic reflectors. In the lower part of the low-beam light source, there is a light distribution screen (see Figure 1, for details, please refer to the national standard on H4 light source for automotive lights), with the screen with the initial 15 ° cut-off line. Light emitted by the light reflected by the reflector, and then by the front of the lights with