Mercedes-Benz 450SEL Dome Light Bulb Size

The Mercedes-Benz 450SEL dome light requires a 6411 bulb size for proper illumination within the interior cabin area. Available data for the specified lighting component covers the period from 1973 through 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 450SEL uses the 6411 bulb for its dome light across all listed model years, spanning 1973-1980.
The 6411 is an ANSI-standardized bulb type, meaning its physical and electrical specifications are defined by a recognized North American industry standard shared across the US and Canada.
This bulb is a festoon type, which is a cylindrical lamp that mounts by pressing its two end caps into spring clips rather than using a screw or bayonet socket.
The 6411 has a 36mm body length, which is the contact-to-contact span relevant to fitment in the dome light housing.
The base designation for the 6411 is SV8.5, indicating a single-contact festoon base with an 8.5mm cap width. A festoon bulb with a different cap width would not seat correctly in the 450SEL dome light fixture.
The 6411 operates at 12 volts, consistent with the standard electrical system voltage of passenger vehicles from this era.
The bulb carries a 5-watt rating, which reflects a relatively low power draw typical of interior courtesy lighting applications.
Because the 6411 specification remained unchanged across the entire 1973-1980 production run of the 450SEL, bulbs sourced for any year within that range share the same fitment requirements.