Mercedes-Benz 450SLC Dome Light Bulb Size

The Mercedes-Benz 450SLC dome light requires a 6411 bulb size for proper illumination within the interior cabin area. Available data covers the specific time range from 1973 to 1980.

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
1973-1980	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 450SLC uses the 6411 bulb for its dome light across all model years represented in the specifications, spanning 1973-1980.
The 6411 is an ANSI-standardized bulb type, meaning its physical and electrical characteristics conform to a defined North American standard recognized in both the United States and Canada.
The 6411 is a festoon-style bulb, a form factor in which the bulb is cylindrical and makes contact at both ends rather than through a screw or bayonet base.
The 6411 bulb has a length of 36mm, which is a critical fitment factor, as festoon bulbs must physically span the socket contacts to make a proper connection.
The SV8.5 base designation refers to the contact cap style used on the 6411, indicating a single-contact festoon base with an 8.5mm cap width.
The 6411 operates at 12 volts and 5 watts, consistent with low-draw interior lighting in 12-volt automotive electrical systems.
When substituting a festoon bulb in a festoon socket, both the length and base width must match the original specification, as an incorrect length will prevent proper contact or cause fitment failure.