A headlamp is a lamp attached to the front
of a vehicle to light the road ahead. While it is common for the term headlight
to be used interchangeably in informal discussion, headlamp is the term for the
device itself, while headlight properly refers to the beam of light produced
and distributed by the device.
Headlamp performance has steadily improved
throughout the automobile age, spurred by the great disparity between daytime
and nighttime traffic fatalities: the US National Highway Traffic Safety
Administration states that nearly half of all traffic-related fatalities occur
in the dark, despite only 25% of traffic travelling during darkness.
China head lamp systems
require periodic maintenance. Sealed beam headlamps are modular; when the
filament burns out, the entire sealed beam is replaced. Most vehicles in North
America made since the late 1980s use headlamp lens-reflector assemblies that
are considered a part of the car, and just the bulb is replaced when it fails.
Manufacturers vary the means by which the bulb is accessed and replaced.
Headlamp aim must be properly checked and adjusted frequently, for misaimed
lamps are dangerous and ineffective.
Over time, the headlamp lens can
deteriorate. It can become pitted due to abrasion of road sand and pebbles, and
can crack, admitting water into the headlamp. "Plastic"
(polycarbonate) lenses can become butty and discoloured. This is due to
oxidation of the painted-on lens hardcoat by ultraviolet light from the sun and
the China head lamp bulbs. If
it is minor, it can be polished out using a reputable brand of a car polish
that is intended for restoring the shine to chalked paint. In more advanced
stages, the deterioration extends through the actual plastic material,
rendering the headlamp useless and necessitating complete replacement. Sanding
or aggressively polishing the lenses, or plastic headlight restoration, can buy
some time, but doing so removes the protective coating from the lens, which
when so stripped will deteriorate faster and more severely. Sourcing and purchasing the high
quality head lamp on gasgoo.com.
The reflector, made out of vapourised aluminum
deposited in an extremely thin layer on a metal, glass or plastic substrate,
can become dirty, oxidised, or burnt, and lose its specularity. This can happen
if water enters the China head lamp,
if bulbs of higher than specified wattage are installed, or simply with age and
use. Reflectors thus degraded, if they cannot be cleaned, must be replaced.
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