The headlamp mainly includes semi enclosed, enclosed, detachable and projection type headlamps. The semi enclosed headlamp is fixed on the mirror by the teeth on the edge of the mirror. There is a rubber sealing ring between the two. The bulb can only be installed from the rear of the mirror. When it is necessary to replace the damaged lens, the teeth on the outer edge of the mirror shall be pried off, and the teeth shall be restored after the new lens is installed. Closed type headlamp, its reflector and light distribution mirror are made of glass, forming a bulb, which is filled with inert gas. It completely avoids the pollution of the reflector and the impact of the atmosphere, so it has high reflection efficiency, good lighting effect, long service life, and has been widely used. The detachable headlamp is composed of components due to the installation of the reflector and the light distribution mirror respectively, so the air tightness is poor. The reflector is easy to be polluted by moisture and dust, which reduces the reflection ability and seriously reduces the lighting effect. At present, it is rarely used. The reflector of the projection headlamp is similar to the ellipse shape and has two focal points. The bulb used is tungsten halogen bulb.
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