(redirected from headlamp)
Also found in: Dictionary, Thesaurus, Medical, Legal, Acronyms, Wikipedia.


, headlamp
a powerful light, equipped with a reflector and attached to the front of a motor vehicle, locomotive, etc.



an electrical device on motor vehicles and other moving machines, used to illuminate, for example, roadways and work positions. The main components of a headlight are the optical element and a stamped housing.

Present-day headlights have a semireplaceable optical element that consists of a steel reflector coated with a thin layer of aluminum, a light source consisting of a single-filament or—more often—a double-filament incandescent bulb, and a lens made of ribbed glass. A high-wattage filament is located at the focal point of the reflector and produces a high beam that is aimed along the roadbed. A low-wattage filament is located above and to the left of the focal point and produces a low beam that is aimed downward and to the right. Such an asymmetric low beam, which is called a European low beam, reduces the danger of blinding the drivers of oncoming vehicles and improves illumination of the right side of the road. Iodine-vapor headlight bulbs are widely used. Such bulbs are filled with a rarefied gas containing an iodine vapor. As compared with conventional bulbs of the same wattage, iodine-vapor bulbs yield twice the roadway illumination and have a longer service life.

Figure 1. A headlight: (1) bulb, (2) bulb adapter, (3) retaining spring, (4) housing, (5) low-beam cable, (6) high-beam cable, (7) adjusting screw, (8) seals, (9) optical element, (10) rims, (11) reflector holder

Every motor vehicle must have at least one pair of headlights. Both headlights must be located symmetrically relative to the longitudinal axis of the vehicle. Many vehicles are equipped with two additional fog lights, the lenses and reflectors of which aim the beams in the horizontal direction closer to the level of the roadway; in such lights, the high beam is cut off by a metallic shield. Special-purpose vehicles, such as fire engines and ambulances, may be equipped with swiveling spotlights that can be turned in various directions. Headlights are sometimes installed at the rear of a vehicle, for example, on tractor trucks. The rear headlights on tractor trucks are used to observe the trailers and other equipment.


Il’in, N. M. Elektrooborudovanie avtomobilei, 4th ed. Moscow, 1975.


A lamp, usually fitted with a reflector and a special lens, that is mounted on the front of a locomotive or automotive vehicle to illuminate the road ahead.
References in periodicals archive ?
Fluorescent delineator posts and road markings can be detected at much greater distances when the standard low-beam headlamps of a car are augmented with auxiliary UV headlamps.
This company offers many lighting options, and the 4-in-1 Rubber Headlamp is a good one.
Arc-tube of proposed metal-halide automotive headlamp compared with a conventional tungsten-halogen lamp.
Streamlight, known primarily for standard flashlights, has entered the headlamp arena with a quality hybrid called the Trident.
As soon as vehicles are detected within 2,600 feet, the equipment adjusts the range of the headlamps within milliseconds.
Operating without a lens, the high brightness of the new OSTAR Headlamp LED has been achieved through a combination of measures.
So we came up with the idea of the Alaska Headlamp as something that could break through the cluttered landscape and become a destination for people around Alaska to visit and learn more about how political issues, news events, and decisions being made from Juneau to the North Slope affect the backbone of the state's essential resource development industry.
Despite the price of LED chip declines, LED headlamps are still more expensive than halogen lamps.
For most of us, it begins with a good headlamp like the Cabela's XPG RGB 11 Headlamp ($45).
A STRIKING new headlamp design will be a highlight of the 2016 model year Range Rover Evoque.
Tokyo, Oct 6, 2014 - (JCN Newswire) - Mazda Motor Corporation will showcase its Adaptive LED Headlights (ALH) next-generation headlamp technology at CEATEC JAPAN 2014, a comprehensive exhibition of cutting-edge IT and electronics.
From September the lower grade GS and XS versions will be replaced with the Discovery SE and SE Tech and all will include cruise control, front fog lights, automatic headlamps and wipers, headlamp power wash, auto dimming rear view mirror and interior foot well and door puddle lamps.