These days a car is omnipresent. You see it everywhere jostling with other vehicles on the road. But have you given a thought to it how chaotic it would be if there were no regulations to govern the traffic on the roads or there were no inbuilt safety features in a car. Car headlights are mostly admired for their brightness and attractive quality, but they are primarily a safety feature. They provide illumination on the road when there is no sunlight at night or the sky is overcast. With their help the driver of a car is able to see other traffic or objects on the road when visibility is poor. Once he sees such objects he can safely maneuver his car on the road. If he is able to see objects at a longer distance he will have more time to maneuver his vehicle. Headlights have therefore to be sufficiently bright.
Headlights are an assembly consisting of a source of light, reflectors, and special lenses, all arranged in a watertight housing unit. These days there are brighter sources of light like LED lights, Xenon lights, and halogen lights. They can cast beam of light up to a sufficiently long distance, thereby enhancing the utility of headlights. The driver can adjust the beam of light in the right direction by manipulating the reflectors and the lenses. Because of the headlights driver of a car can see the road ahead but they may also blind the driver of a vehicle coming from the opposite direction. To avoid that the headlights are located in such a position that they avoid blinding or devices like dimmers are used.
The housings of car headlights need a special mention because one can experiment with their designs and colors.