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Xenon high-intensity-discharge headlights have bulbs, but unlike halogen lights, they don’t have filaments so they tend to last longer than halogens but not as long as LEDs. LEDs are becoming the dominant type of headlight because they use less energy than other types of lights, they last longer and they keep getting cheaper to manufacture.
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LEDs last longer than either halogens or xenon light, though they become dimmer as they age. LEDs are about 90% more efficient than incandescent bulbs and generate less heat. With LEDs, electric current passes through a semiconductor (or diode) to produce light that is brighter and often has a wider beam pattern than other types of headlights. Because they’re small, LEDs can be squeezed into tight spaces and arranged in a variety of patterns, giving vehicle engineers and designers more leeway to be creative. In automotive applications, LEDs have a distinctive white color and are brighter than halogen lights, though they usually aren’t as bright as xenon lights. Related: Standard Headlights, Pedestrian Protection Mandates Raise Bar for Crash-Test Honors LED Headlights What’s the difference between these two types of headlights? The familiar warm, yellow glow cast by halogen bulbs is rapidly being replaced by brighter and whiter light-emitting diodes and even brighter high-intensity-discharge lights filled with xenon gas. Nighttime driving these days can turn into a dazzling - even blinding - light show from the different types of headlights available on newer vehicles.