Mercedes-Benz SLK320 Dome Light Bulb Size

The Mercedes-Benz SLK320 dome light requires bulb size 6411 or H6W depending on the specific application for the vehicle. Data for the lighting components covers the range from 2001 to 2004.

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
2004	H6W
2001-2003	6411

Bulb Specifications

Description	Bulb Size
ECE standard (Europe & worldwide). Single-filament signalling bulb with BAX9s base. 12V, 6W.	H6W
ANSI standard (US & Canada). Festoon bulb, 36mm length, SV8.5 base. 12V, 5W.	6411

Other Locations

Additional Notes

The Mercedes-Benz SLK320 dome light uses two distinct bulb types across its model years: the H6W for 2004 and the 6411 for 2001-2003.
The H6W is an ECE-standardized bulb, meaning it follows European and international automotive lighting regulations. It operates at 12V and draws 6W.
The H6W uses a BAX9s base, which is an offset pin base. This base type is not interchangeable with standard bayonet or festoon fittings.
The 6411 is an ANSI-standardized festoon bulb, governed by North American automotive standards. It operates at 12V and draws 5W.
The 6411 measures 36mm in length and uses an SV8.5 base, which is a single-contact festoon cap common in interior lighting applications.
The H6W and 6411 are not interchangeable. Their base types, physical form factors, and wattage ratings are all different, making direct substitution between the two incompatible.
The wattage difference between the two bulbs is small, with the H6W rated at 6W and the 6411 at 5W, but the differing base designs make this a fitment distinction rather than a performance one.