Mercedes-Benz R350 Map Light Bulb Size

The Mercedes-Benz R350 map light utilizes a specific 12961 bulb size for interior illumination. Available data covers a production range spanning from 2006 through 2012 for the specified component.

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
2006-2012	12961

Bulb Specifications

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

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Additional Notes

The Mercedes-Benz R350 uses the 12961 bulb for the map light across all listed model years, spanning 2006-2012.
The 12961 is a Philips part number designating a miniature wedge bulb in the T10 form factor.
T10 refers to the bulb's tubular shape, with the number indicating a width of 10 millimeters.
The 12961 uses a W2.1x9.5d wedge base, which is a pinless base type that is held in place by the socket walls rather than by pins or a bayonet mechanism.
The bulb operates at 12 volts and 5 watts, consistent with standard low-power interior lighting in passenger vehicles.
The W2.1x9.5d base designation is an IEC standard, meaning the 12961 is interchangeable with other T10 wedge bulbs sharing that same base specification, provided the voltage and wattage ratings are also matched.
Because the R350 map light socket is designed for the W2.1x9.5d wedge base, bulbs with different base types are not compatible, regardless of physical similarity in size.