It consists of a reflector, a light distribution mirror, a light bulb (or LED), a light shield, a vertical light adjustment device, and a casing. The main types are movable devices with replaceable light bulbs and movable reflectors. Most light bulbs are 55W halogen bulbs. In addition, beam adjustment is generally only in the up and down direction.

To suppress the phenomenon of light film with unclear field of view caused by diffuse reflection of water and dust particles floating in the air, it is most important to block visible light in the vertical direction. In addition, to expand the horizontal diffusion angle, uniform light distribution is required. The color of the light is white or light yellow.

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