H11 Bulb vs. H7 Bulb
Comparing 2 standards across 10 specifications. 10 key differences identified.
The H11 Bulb (standardized under UN ECE Regulation 37 with a PGJ19-2 right-angle plastic base) is the modern standard for front fog lights and projector low-beam headlights. Featuring a built-in silicone weather-sealing O-ring, an integrated 90-degree automotive locking connector, and an axial 55W filament generating 1,350 lumens.
The H7 Bulb (standardized under UN ECE Regulation 37 with a PX26d flanged base) is the most widely used single-filament halogen automotive headlight bulb in the world. Operating at 55W nominal at 12V (rated at 13.2V test voltage), it generates 1,500 lumens (±10%) primarily for low-beam projector and reflector headlight assemblies.
Specification Comparison Table
10 Parameters| Parameter / Spec | ||
|---|---|---|
|
Standardization
|
UN ECE R37 Category H11 / US DOT Category H11 | UN ECE R37 Category H7 / IEC 60061-1 sheet 7004-5 / US DOT Category H7 |
|
Base Socket Designation
|
PGJ19-2 (Right-angle molded plastic base with 3 asymmetrical metal locking tabs) | PX26d (pre-focused metal circular mounting flange with one flat reference indexing tab) |
|
Nominal Power & Voltage
|
55 W @ 12V (tested at 13.2 V; draws 4.17 A) | 55 W @ 12V nominal (tested at 13.2V standard regulation voltage; draws ~4.17 A) |
|
Luminous Flux Output
|
1,350 lumens ± 10% (at 13.2 V) | 1,500 lumens ± 10% (at 13.2 V) |
|
Weatherproofing
|
Integrated orange high-temperature silicone O-ring seals directly against headlight housing barrel | — |
|
Electrical Plug
|
Integrated female automotive connector with locking snap tab (IEC 60061-1) | — |
|
Related Family (H8 / H9 / H16)
|
H8: 35W (PGJ19-1) | H9: 65W (PGJ19-5, 2100 lm) | H11: 55W (PGJ19-2) | H16: 19W (PGJ19-3) | — |
|
Filament Type
|
— | Single axial tungsten filament (no internal shield; strictly a single-beam bulb) |
|
Average Lifespan (B3 / Tc)
|
— | B3 (97% survival): ~330 hours | Tc (63.2% failure): ~550 hours (standard halogen) |
|
Electrical Terminals
|
— | 2 spade push-on terminals (6.3 mm faston tabs spaced 14.5 mm apart) |