A headlight, or also known as a headlamp, is a lamp that is usually attached to the front of the vehicle with the purpose of lighting up the road ahead during periods of low visibility. Modern headlights are practically operated through and by the means of electricity. They are positioned in pairs, one or two lights on each side of the front of the vehicle.
The headlamp system is actually required so as to produced a low and a high beam. The high beams, also known as main beams, full beams, or driving beams, are used and they cast most of their light straight ahead, thus enabling the driver to maximize his seeing distance. However, producing too much light and glare could also affect other drivers on the road. On the other hand, low beams, which are also called as dipped beams, have stricter control of upward light. They direct most of their light downward and also either rightward or leftward for right-traffic and left-traffic countries, respectively. It gives the vehicle drivers a safe forward visibility devoid of excessive glare or back dazzle.
Out in the market are different types of headlights for car owners to choose from. One of these is the reflector optics which has a light source, or filament or arc, that is placed at or near the focus of a reflector. This could be parabolic or of non-parabolic complex shape. The reflector optics has a design that starts as a parabola standing in for the size and shape of the completed package. The precise shape of each segment of this light is designed so much so that their cumulative effect is able to produce the required distribution pattern. Another type is the projector optic that has a system where in a filament is located at one focus of an elliptical and a condenser lens at the front of the lamp. Other types include HID headlamps (which stands for high-intensity discharge), LED headlights, and directional headlights.
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These lights, however, must also be kept in a proper aim or alignment for safety. There are already regulations for aim and these vary from country to country. In the United States, headlights are all aimed the same, regardless of mounting height. This gives all vehicles a roughly equal seeing distance and all drivers roughly equal glare. The design, performance and installation of all these motor vehicle lighting devices, which includes the headlights, are carefully regulated by the Federal and Canada Motor Vehicle Safety Standard 108.
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