H11 Bulb vs. W5W / T10 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 W5W Bulb (commonly called a T10 Wedge or 194 / 168 in North America, standardized under ECE Regulation 37 with a W2.1×9.5d base) is the universal automotive miniature capless glass bulb. Operating at 5W at 12V (generating ~50 lumens), it is the standard for front parking lights, side turn indicators, license plate lamps, and cabin interior courtesy lights.
Specification Comparison Table
10 Parameters| Parameter / Spec | ||
|---|---|---|
|
Standardization
|
UN ECE R37 Category H11 / US DOT Category H11 | UN ECE R37 Category W5W / US DOT Type 194 / 168 / IEC 60061-1 |
|
Base Socket Designation
|
PGJ19-2 (Right-angle molded plastic base with 3 asymmetrical metal locking tabs) | W2.1×9.5d (Capless glass wedge base: 2.1 mm thickness × 9.5 mm width) |
|
Nominal Power & Voltage
|
55 W @ 12V (tested at 13.2 V; draws 4.17 A) | 5 W @ 12V (tested at 13.5 V; draws approx. 0.40 A) |
|
Luminous Flux Output
|
1,350 lumens ± 10% (at 13.2 V) | 50 lumens ± 20% (at 13.5 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) | — |
|
Bulb Envelope Diameter
|
— | T10 designation indicates tubular glass envelope diameter of 10.0 mm (3/8 in) |
|
Electrical Contact Wires
|
— | Two bare molybdenum lead wires folded across opposite sides of the flattened glass wedge base |
|
Applications
|
— | Front sidelights/eyebrow markers, side fender repeaters, license plate illumination, interior map/dome lights, trunk cargo lamps |