Mercedes-Benz C320 Dome Light Bulb Size

The Mercedes-Benz C320 dome light requires a 6411 bulb size for proper installation and function within the interior lighting system. Data for the specific component covers the range from 2001 to 2005.

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
2001-2005	6411

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 36mm length, SV8.5 base. 12V, 5W.	6411

Other Locations

Additional Notes

The Mercedes-Benz C320 uses the 6411 bulb for the dome light across the 2001-2005 model years.
The 6411 is a festoon-style bulb, meaning it is cylindrical in shape and makes contact at both flat ends rather than through a screw or pin base.
The 6411 bulb measures 36mm in length, which is the span between its two end caps and determines physical fitment within the dome light housing.
It uses an SV8.5 base designation, which refers to the end cap width of 8.5mm and is a standard identifier for festoon bulbs of this size class.
The bulb operates at 12 volts and 5 watts, consistent with low-power interior lighting applications in passenger vehicles.
The 6411 designation follows the ANSI standard used in the United States and Canada, meaning it conforms to a defined set of electrical and physical specifications recognized across North American markets.
Festoon bulbs of different lengths are generally not interchangeable even when they share the same base type, as the housing contacts must align precisely with the end caps for the bulb to seat and function correctly.