Car headlights usually consists of the following main components:

1. Light bulb: Light bulb is the light source of car headlights, and halogen bulb, xenon bulb or LED bulb is usually used. The light bulb is excited to emit light by current, resulting in lighting effect. Different types of light bulbs have different brightness, energy consumption and life characteristics.

2. Lampshade: The lampshade is the shell that protects the light bulb, and is usually made of transparent or translucent materials, such as glass or plastic. The lampshade can play the role of waterproof, dustproof and protecting the light bulb, and can also affect the transmission and scattering effect of the light beam.

3. Reflecting cover: The reflecting cover is located behind the light bulb and is used to reflect and focus the light emitted by the light bulb to form a clear light beam. The design of reflector can affect the shape, direction and range of light beam and the lighting effect and distribution of light.

4. Circuit controller: The circuit controller is the control system of car headlights, which is used to control the brightness, switch and beam mode of the light bulb. Some car headlights are also equipped with intelligent lighting systems, which can automatically adjust the brightness and direction of light beams according to vehicle speed, lighting conditions and surrounding environment.

5. Cooling system: car headlights will generate a certain amount of heat when working. In order to keep the stable working temperature of the light bulb, it is usually equipped with a cooling system. The cooling system can dissipate heat by means of fins, fans or cooling channels, so as to keep the bulb working normally and prolong its life.

To sum up, the main components of car headlights include light bulb, lampshade, reflector, circuit controller and cooling system. These components work together to ensure that car headlights has good lighting effect, stable working performance and long service life.