Mercedes-Benz SLK280 Dome Light Bulb Size

The Mercedes-Benz SLK280 dome light requires bulb size 12961 or H6W depending on the specific version required for the interior lighting system. Data for the provided specifications covers the range from 2006 to 2008.

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
2007-2008	12961 (Front)
2006	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 SLK280 front dome light uses two distinct bulb types across its model years: the 12961 for 2007-2008 and the H6W for 2006.
The 12961 is a Philips part number designation for a miniature wedge bulb in the T10 form factor, operating at 12V and rated at 5W.
The T10 bulb uses a W2.1x9.5d base, which is a wedge-style base that relies on spring tension within the socket rather than a locking twist mechanism.
The H6W is an ECE-standard designation recognized across European and worldwide markets, operating at 12V and rated at 6W.
The H6W uses a BAX9s base, which is an offset pin bayonet base. The asymmetric pin placement means it is not interchangeable with standard bayonet bases such as BA9s.
The W2.1x9.5d wedge base of the 12961 and the BAX9s bayonet base of the H6W are physically incompatible socket types, making the two bulbs non-interchangeable despite their similar voltage ratings.
The 2006 Mercedes-Benz SLK280 front dome light draws 6W through the H6W, while the 2007-2008 model years draw 5W through the 12961, reflecting a difference in power consumption between the two fitments.