5/94 Euro 325i coupe. Originally Posted by surferpacifc. IIRC H1 is headlight and H7 is fog. ZKW uses H1 standard (or at least that's what most people I know have on theirs). E36 fogs use H1 as well. The H7 are more likely to be used in free-form and reflector headlights and H1 in projectors (at least in the E36 world).

What makes each bulb unique is the type of fitting or base, most easily identified by the prongs that are used to plug in the bulb. Most headlamp bulb fittings, including the popular H1 and H7 bulbs, have two prongs on the base. Some bulbs, such as the H3 bulb, look a bit different.

Well, quite simply, the answer is yes. All of the bulbs we sell are universal fittings. If, for example, your vehicle uses standard factory fitted H1 car bulbs, and you are looking at OSRAM Night Breaker Unlimited H1 car bulbs on our website, the two are directly interchangeable and physically exactly the same.
600% brighter than halogen headlight bulbs. 100W super bright series with 80MIL large automotive grade customized chips, 20000 lumens per pair, 6500K cool white light. No dark spots. Correct angle and direction prevent other drivers from being blinded. High-output bulbs are the best choice for people who live in rural areas. 6,000K Cool White. Runner-up for brightest H1 LEDs. 100,000-hour lifespan. 120W per set. External CAN bus driver. IP68 Waterproof. For vehicles with single bulb filaments for high and low beams, the H1 bulb is the one you need. After a while, the factory-installed halogens will burn out and need to be replaced. Bulb Designation: Description: Designation: H1 Bulb Filament Type: Single Filament Contact Pins: One Base Width: 21mm Designation: H4 Bulb Filament Type: Double Filament Contact Pins: Three Base Width: 43mm Designation: H7 Bulb Filament Type: Single Filament Contact Pins: Two Base Width: 30mm Designation: H15 Bulb Filament Type: Double Filament 0cjsi.
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  • difference between h1 and h7 bulbs