Standing in the auto parts aisle staring at racks of bulbs labeled H7, 9005, H11, H4, and more can be overwhelming. Each bulb type has a different base, different application, and different light output — and choosing the wrong one means the bulb simply will not fit.
Bulb Type Basics
Automotive bulb types are standardized by regulations from UN ECE Regulations (Europe) and SAE standards (US). Each bulb type has a unique base design that ensures only the correct bulb fits the socket. The bulb type designation (H4, H7, 9005, etc.) describes the base geometry, wattage rating, and application.
H4 (9003) — Dual Beam
Most common bulb worldwide: H4 bulbs contain both a low beam and high beam filament in a single bulb. They are used in millions of vehicles globally — from 1980s sedans to modern motorcycles. The bulb has a rectangular metal base with three spring-loaded locking tabs. H4 LED upgrades are among the best-selling automotive lighting products.
Key specs: Dual filament (low + high beam in one bulb). Base: P43t (metal with 3 tabs). Power: 60/55W. Lumens: ~1,000 low / ~1,500 high.
H7 — Single Beam European
H7 is the most common single-beam headlight bulb, standard on European vehicles from BMW, Mercedes, Audi, Volkswagen, and many others. It has a round metal base with two flat alignment tabs. H7 is a single-beam bulb — separate bulbs are needed for low and high beams.
Key specs: Single beam. Base: PX26d (round metal, 2 tabs). Power: 55W. Lumens: ~1,100-1,500.
9005 — High Beam American
9005 (also called HB3) is the standard high beam bulb for many American vehicles from Ford, GM, Chrysler, and Toyota. It has a distinctive large plastic base with three locking tabs. 9005 is a single-beam bulb used exclusively for high beams in most applications.
Key specs: Single beam (high beam). Base: P20d (plastic, 3 tabs). Power: 65W. Lumens: ~1,700-2,000.
9006 — Low Beam American
9006 (HB4) is the companion to 9005, used for low beams on many of the same American vehicles. It has a similar plastic base but with a different keyway that prevents cross-fitting. The beam pattern is designed for the controlled cut-off required for low beams.
Key specs: Single beam (low beam). Base: P22d (plastic, 3 tabs). Power: 55W. Lumens: ~1,000-1,300.
H11 — Japanese/Korean
H11 is widely used on Japanese (Toyota, Honda, Nissan) and Korean (Hyundai, Kia) vehicles for low beams and fog lights. It has a twist-lock base with two alignment tabs. Some vehicles also use the 9005 variant for high beam with H11 for low beam.
Key specs: Single beam. Base: PGJ19-2 (plastic, 2 tabs). Power: 55W. Lumens: ~1,000-1,350.
Other Common Types
- H1: Single beam, used in some European high beams and fog lights
- H3: Single beam, used in fog lights on many European and Japanese vehicles
- H8/H9/H11 (family): Similar base, interchangeable with modifications
- 9007 (HB5): Dual beam (like H4), used on some Ford and Chrysler vehicles
- PSX24W / PSX26W: Specialty bulbs for specific applications
Bulb Type Comparison Table
| Type | Beam | Base | Power | Common Vehicles |
|---|---|---|---|---|
| H4 (9003) | Dual (low+high) | P43t metal | 60/55W | Universal — most cars 80s-2000s |
| H7 | Single | PX26d metal | 55W | BMW, Audi, VW, Mercedes, Ford EU |
| 9005 (HB3) | Single high | P20d plastic | 65W | Ford, GM, Chrysler, Toyota |
| 9006 (HB4) | Single low | P22d plastic | 55W | Ford, GM, Chrysler, Toyota |
| H11 | Single low/fog | PGJ19-2 plastic | 55W | Toyota, Honda, Hyundai, Kia |
| 9007 (HB5) | Dual | P26d plastic | 60/55W | Ford, Chrysler (older models) |
How to Find Your Bulb Type
- Check your owner’s manual — it lists all bulb types
- Remove the existing bulb — the type is printed on the metal or plastic base
- Use an online bulb finder from major brands (enter vehicle year/make/model)
- Check manufacturer parts catalogs or parts store websites
Upgrading to LED
LED upgrades are available for virtually every common bulb type: H4, H7, 9005, 9006, H11, H1, H3, and more. Most LED bulbs are designed as direct replacements, fitting into the existing socket without modification. For European vehicles with CANbus systems, look for “CANbus-ready” LED bulbs that include built-in decoders to prevent error messages.
TUHO LED Solutions for Every Bulb Type
Find the right LED upgrade for your vehicle. TUHO Lighting manufactures LED bulbs for all major automotive bulb types: H4, H7, 9005, 9006, H11, and more. Our bulbs feature direct-fit designs, precision emitter positioning, and robust thermal management. Available for individual purchase or bulk OEM/ODM orders. Contact Us for OEM/ODM
FAQ
H7 vs 9005 difference?
H7 = round metal base, single beam, European. 9005 = plastic 3-tab base, high beam, American.
Is H11 same as 9005?
No — different base shapes. Not directly interchangeable. H11 = Japanese/Korean low beams.
Most common bulb type?
H4 (9003) worldwide for dual beam. H7 for single beam on European cars.
How to find my bulb type?
Check owner’s manual, read the base of the existing bulb, or use an online bulb finder.
Can H7 be upgraded to LED?
Yes — H7 LED bulbs are widely available. Choose CANbus-ready versions for European cars.
Conclusion
Understanding automotive bulb types is the first step to a successful headlight upgrade. Each bulb type — H7, 9005, H11, H4 — has a specific base design and application that determines compatibility with your vehicle. Once you know your bulb type, upgrading to LED is straightforward and delivers substantial improvement in visibility, efficiency, and longevity.
