Mercedes-Benz C350 Map Light Bulb Size

The Mercedes-Benz C350 map light utilizes 12961 and 6411 bulb sizes for the interior lighting system. Available data for the specified components covers the period from 2006 to 2015.

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
2008-2015	12961
2006-2007	6411

Bulb Specifications

Description	Bulb Size
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961
ANSI standard (US & Canada). Festoon bulb, 36mm length, SV8.5 base. 12V, 5W.	6411

Other Locations

Additional Notes

The Mercedes-Benz C350 map light uses one of two bulb types across its model years: the 12961 and the 6411, both rated at 12V and 5W.
The 12961 is a Philips part number designating a miniature wedge bulb in the T10 form factor, fitted with a W2.1x9.5d base. This base type uses two small pins set 9.5mm apart, which lock the bulb into a wedge-style socket without a separate retaining mechanism.
The 6411 follows the ANSI standard recognized in the US and Canada. It is a festoon bulb measuring 36mm in length with an SV8.5 base, a cylindrical type that is held in place by spring-loaded contacts at each end of the housing.
Because the 12961 uses a wedge base and the 6411 uses a festoon base, the two bulb types are not interchangeable. Each requires a physically different socket design.
The Mercedes-Benz C350 (2008-2015) uses the 12961 bulb for the map light position.
The 2006-2007 C350 uses the 6411 festoon bulb in the same map light position.
The 12961 and 6411 share identical electrical ratings of 12V and 5W, meaning both draw the same power and operate at the same voltage despite their physical incompatibility.
The T10 designation of the 12961 refers to a bulb body width of 10/8 of an inch, a standard sizing convention used across many miniature automotive bulb applications.