Mercedes-Benz ML450 Dome Light Bulb Size

The Mercedes-Benz ML450 dome light requires a bulb size of 12961 for proper installation within the interior overhead lighting fixture. Data for 12961 bulbs covers the specific range from 2010 through 2011.

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	Bulb Size
2010-2011	12961 (Rear)

Bulb Specifications

Description	Bulb Size
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961

Other Locations

Additional Notes

The 12961 is a Philips part number designating a miniature wedge bulb in the T10 form factor, fitted with a W2.1x9.5d base. It operates at 12 volts and draws 5 watts.
The W2.1x9.5d base is a wedge-type connection, meaning the bulb is held in place by tension from the socket rather than by a bayonet or screw mechanism.
The Mercedes-Benz ML450 uses the 12961 bulb for the rear dome light position across the 2010-2011 model years.
The T10 designation refers to the bulb's tubular envelope width, which is 10 millimeters. This sizing is a standard reference used across many automotive interior lighting applications.
At 5 watts, the 12961 is a low-output bulb consistent with interior courtesy and dome light functions, where high luminosity is not required.
The W2.1x9.5d base type is specific to wedge bulbs and is not interchangeable with bayonet bases such as the BA9s or festoon-style connectors, making base compatibility a relevant factor when sourcing a replacement.