9006 vs HB4
The 9006 and HB4 are physically interchangeable bulb types that share the same base and socket design. Both bulbs fit the same housing, making them direct substitutes in most applications. The 9006 is found in many vehicles, commonly in the various positions position, while the HB4 appears in many vehicles, typically used for various positions. Although they fit the same socket, there may be minor differences in wattage or light output between the two. Below we break down the specifications, compatible vehicles, and practical swap guidance to help you choose the right bulb.
Vehicles Using 9006
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Vehicles Using HB4
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Use Both
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Specification Comparison
| Feature | 9006 | HB4 |
|---|---|---|
| Mount Type | push-and-twist L-shaped bayonet lock | push-and-twist L-shaped bayonet lock identical to 9006 |
| Dual Filament | No (single filament) | No (single filament) |
| Interchangeable | Yes, fits HB4 socket | Yes, fits 9006 socket |
| Also Known As | HB4 | 9006 |
Can You Swap 9006 and HB4?
The 9006 and HB4 share the same physical base and socket type, which means you can use either one in a housing designed for the other. However, there may be slight differences in rated wattage or light output between the two. For the best results, use the specific bulb type listed in your vehicle's owner's manual. If your manual specifies 9006 but you can only find HB4, it will fit and work safely. When upgrading to LED, look for a kit that lists both 9006 and HB4 compatibility.