H4 vs HB2
The H4 and HB2 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 H4 is found in many vehicles, commonly in the various positions position, while the HB2 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 H4
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Vehicles Using HB2
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Use Both
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Specification Comparison
| Feature | H4 | HB2 |
|---|---|---|
| Mount Type | spring clip retainer with a three-prong base | spring clip retainer with a three-prong base identical to H4 |
| Dual Filament | Yes (dual filament) | Yes (dual filament) |
| Interchangeable | Yes, fits HB2 socket | Yes, fits H4 socket |
| Also Known As | HB2, 9003 | H4, 9003 |
Can You Swap H4 and HB2?
The H4 and HB2 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 H4 but you can only find HB2, it will fit and work safely. When upgrading to LED, look for a kit that lists both H4 and HB2 compatibility.