When upgrading or replacing your car’s headlight bulbs, you might come across 9004 (HB1) and 9007 (HB5) bulbs. While they look similar and are often confused, they have distinct differences in design, function, and compatibility.
In this blog, we’ll compare 9004 vs 9007 bulbs in detail, using a comparison table for clarity, and help you determine which one is right for your vehicle.
Key Differences Between 9004 vs 9007 Bulbs
| Feature | 9004 (HB1) | 9007 (HB5) |
|---|---|---|
| Function | Dual-beam (high + low) | Dual-beam (high + low) |
| Filament Type | Two separate filaments (high & low) | Two filaments (but different wiring) |
| Base Design | Three-prong (P43t-38) | Three-prong (P43t-41) |
| Interchangeable | No (different wiring & base) | No (different wiring & base) |
Function & Filament Design
Both 9004 and 9007 are dual-beam bulbs, meaning they handle both high and low beams in a single bulb. However, their internal wiring differs—9004 bulbs have separate high/low filaments, while 9007 bulbs have a shared ground wire, making them incompatible with each other.
Base & Fitment
9004 (HB1) uses a P43t-38 base, while 9007 (HB5) uses a P43t-41 base—meaning they cannot be swapped without an adapter. Some aftermarket LED kits include adapters to convert between these types, but OEM housings require the correct bulb.
Conclusion: Which One Do You Need?
- If your car originally uses 9004 (HB1), stick with it—no direct swap for 9007.
- If your car uses 9007 (HB5), stick with it—no direct swap for 9004.
- Always check your vehicle’s manual before buying replacements.
Still unsure? You can check the fitment with your vehicles here: