Mercedes-Benz 500SEC Dome Light Bulb Size

The Mercedes-Benz 500SEC dome light requires a 6411 bulb size for proper installation within the interior overhead lighting fixture. Data for 6411 bulb specifications covers the 1984 to 1993 production range.

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
1993	6411
1984-1985	6411

Bulb Specifications

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

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Additional Notes

The 6411 is the dome light bulb size for the Mercedes-Benz 500SEC across all listed model years.
The years covered by these specifications are 1984, 1985, and 1993.
The 6411 bulb follows the ANSI standard, meaning it conforms to a specification recognized across the United States and Canada.
It is a festoon-type bulb, which is a cylindrical lamp that makes contact at both ends rather than through a screw or bayonet base.
The bulb has a length of 36mm and uses an SV8.5 base, which refers to the end-cap style and the 8.5mm width of the metal contacts at each end.
The electrical rating is 12 volts and 5 watts, consistent with standard low-power interior lighting in automotive applications.
Because the 6411 is an ANSI-standardized festoon bulb, other bulbs sharing the same 36mm length and SV8.5 base type are generally considered interchangeable, provided the voltage and wattage ratings are compatible.