Hummer H3T License Plate Bulb Size

The Hummer H3T uses a 194 bulb size for the license plate light fixture. The replacement chart covers 2009 to 2010 vehicle production years with corresponding bulb specifications.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	US Type	EU Type	Shop
2009-2010	194	W5W	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.	194	Check Price
ECE standard (Europe & worldwide). Single-filament signalling bulb with W2.1x9.5d wedge base. 12V, 5W.	W5W	Check Price

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Additional Notes

The 194 bulb is the sole license plate bulb size specified for the Hummer H3T across its 2009-2010 model years.
The 194 is classified as a miniature wedge bulb, designated T10 in the international bulb sizing system, where "T" refers to the tubular shape and "10" indicates the width in eighths of an inch.
The 194 operates at 12 volts and draws 3.78 watts, placing it in the low-wattage range typical of automotive indicator and illumination bulbs.
The 194 carries ANSI standardization, meaning its physical and electrical specifications are governed by a recognized industry standard applicable in both the United States and Canada.
The wedge base design of the T10 eliminates a separate metal base, as the glass envelope itself is pinched at the bottom to form the electrical contacts, which distinguishes it from bayonet or screw-base bulb types.