Mercedes-Benz 300SD Dome Light Bulb Size

The Mercedes-Benz 300SD dome light requires a 6411 bulb size for proper installation and function within the interior lighting system. Available data for the specified component covers the period from 1978 to 1993.

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
1992-1993	6411
1978-1985	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 300SD uses the 6411 bulb size across all model years listed in the specifications, spanning 1978-1985 and 1992-1993.
The 6411 is an ANSI-standardized bulb type, meaning its physical and electrical specifications are governed by a recognized North American standard applicable in both the United States and Canada.
The 6411 is a festoon-style bulb, a form factor characterized by a cylindrical tube with metal end caps that seat into spring-loaded holders rather than a traditional socket.
The 6411 bulb has a 36mm length, which is a critical fitment factor, as festoon bulbs must match the holder span precisely to make proper contact.
The 6411 uses an SV8.5 base, a designation that refers to the end cap width of the festoon bulb, measuring 8.5mm across each contact cap.
The 6411 operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles of this type.
The 6411 is rated at 5 watts, placing it in the low-wattage category typical of interior courtesy and dome lighting applications.
Because the 6411 is an ANSI-standardized bulb, it is interchangeable with any other bulb carrying the same 6411 designation regardless of manufacturer, provided the physical and electrical specifications match.