Philips sells five distinct headlight bulb lines, not one. Here is how X-tremeVision, RacingVision GT200, WhiteVision ultra and Ultinon Pro6000 LED actually…
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HID isn't a filament or a diode, it's a ballast striking a xenon arc. Here is the real difference between genuine HID…
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H4 is not the only halogen headlight bulb out there. Here is how to identify H7, H11, H13, 9005 and 9006, which…
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Genuine sealed beam headlights explained: the 1940-1983 federal mandate, standard round and rectangular sizes and SAE designations, which vehicles still use them,…
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Photo by UAB Partecha, licensed CC BY-SA 4.0. A burned-out bulb is a five-minute fix. A cracked lens, a fogged-up housing, or…
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Most "LED headlight conversion kits" are drop-in bulbs for a halogen socket, and those are not FMVSS 108 compliant. Here is how…
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A true ECE-spec H4 bulb and the US-market 9003/HB2 variant look interchangeable but use different internal shields, and the wrong one aimed…
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IIHS found good-rated headlights cut nighttime crash rates by 19 percent, and low-beam reach ranges from 125 to 460 feet. But dropping…
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