Mercedes-Benz CLK430 Map Light Bulb Size

The Mercedes-Benz CLK430 Map Light requires bulb size 12961 or H6W depending on the specific application for the vehicle. Data for the bulb sizes covers the range from 1999 to 2003.

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
2000-2003	12961
1999	H6W

Bulb Specifications

Description	Bulb Size
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961
ECE standard (Europe & worldwide). Single-filament signalling bulb with BAX9s base. 12V, 6W.	H6W

Other Locations

Additional Notes

The Mercedes-Benz CLK430 map light specification covers the 1999-2003 model years, with two distinct bulb types used across that range.
The 12961 is a Philips part number designation for a T10 miniature wedge bulb with a W2.1x9.5d base, rated at 12V and 5W.
The T10 wedge form factor is one of the most widely used miniature bulb formats in automotive interior lighting, relying on the wedge-shaped base itself to make electrical contact rather than a separate metal pin or bayonet fitting.
The H6W follows the ECE (Economic Commission for Europe) naming standard, which is used across European and international markets. It is a single-filament signalling bulb with a BAX9s base, rated at 12V and 6W.
The BAX9s base uses an offset pin arrangement, which physically prevents the bulb from being seated incorrectly in its socket.
The CLK430 (1999) uses the H6W bulb, while the 2000-2003 model years use the 12961. These two bulb types have different base designs and are not interchangeable with each other.
The H6W operates at 6W, while the 12961 operates at 5W. Both run on a 12V electrical system, consistent with standard automotive voltage.