Halogen headlights were introduced in Europe in 1962 and the US in 1978. They use tungsten filaments with a small amount of halogen gas, which prevents the bulb from dimming and allows for more light with the same amount of power. They burn at high temperatures and are designed as smaller bulb units that mount in the center of a traditional headlight housing. They are brighter and last twice as long as incandescent versions. European laws increased light output levels to 225,000 candlepower, while US automakers restricted their candela output to 150,000 to save energy.
Halogen headlamps are an improvement over traditional incandescent automotive headlamps, first introduced in Europe in 1962 and later in the United States in 1978. Early halogen headlamps had to be enclosed in quartz lamps in automobiles, since that the halogen gas environment was created for the filament. A temperature that could melt conventional glass. In the 1980s, halogen technology improved to the level of self-contained bulbs that could now be mounted in clear plastic fixtures and were much more affordable and easy to change. This led to a proliferation in various shapes and designs of halogen headlights as car manufacturers customized their appearance to make their car models different from each other.
The basic design of a halogen headlight is not that different from its predecessor. While an incandescent headlamp uses a tungsten filament surrounded by an inert gas, such as a combination of nitrogen, argon, and krypton, a halogen headlamp uses the same tungsten filament, but instead has a small amount of halogen gas added with the gas. standard mix. This is what gives halogen headlights advantages over earlier versions of headlights. The halogen undergoes a chemical reaction with the tungsten filament creating halides, which deposit oxidized tungsten compounds on the filament and prevent tungsten particles from adhering to the bulb surface. This process prevents the bulb from dimming as it ages, and also allows you to generate more light with the same amount of electrical power.
However, for halogen headlamps to work, they must burn at a high temperature, usually around 482° Fahrenheit (250° Celsius). This temperature, and the need for higher gas pressure within the bulb, has led to halogen headlights being designed as smaller bulb units that mount in the center of a traditional headlight housing. The housing lens and light reflector can therefore be non-pressurized and made of plastic that does not have to withstand the high temperatures or pressures that incandescent headlamps were built for.
These design specifications for halogen headlights that took root in automotive manufacturing in the 1980s have led to bulbs that are brighter and last approximately twice as long as conventional incandescent versions. These features were taken advantage of in different ways in both Europe and the US. European laws used the ability of halogen headlights to burn more with the same amount of electrical consumption as a standard headlight to increase light output levels to 225,000 candlepower, a measure of luminosity. US automakers, by contrast, chose to use the energy savings of halogen headlamps by restricting their candela output to a 150,000-rated candela output, which used less electricity than a standard incandescent headlamp that typically put out 75,000. light candles. Cars in European cities generally have brighter lights that reach farther down the road at night than their American counterparts, therefore, but American cars have a slight increase in fuel efficiency due to their need to produce less electricity to power the halogen headlamps.
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