Mercedes-Benz 280SE License Plate Bulb Size

The Mercedes-Benz 280SE license plate requires a DE3423 bulb size for proper illumination of the rear vehicle identification area. Available data for the specified lighting component covers the period from 1968 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
1977-1980	DE3423
1968-1973	DE3423

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V.	DE3423

Other Locations

Additional Notes

The Mercedes-Benz 280SE uses the DE3423 bulb for the license plate position across all listed model years from 1968-1973 and 1977-1980.
The DE3423 is a festoon-style bulb, meaning it is cylindrical in shape and makes electrical contact through metal caps at both ends rather than through a base socket.
Festoon bulbs seat by pressing lengthwise into spring-loaded clips, which hold the bulb in place through tension against the end caps.
The DE3423 has a nominal length of 41mm, which is a standard festoon size also commonly referenced as an interior dome or map light bulb in many vehicle applications.
The bulb operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles of this era.
The DE3423 designation follows ANSI standardization, meaning the bulb specification is recognized across the United States and Canada under a unified classification system.
Because the DE3423 is an ANSI-standardized part, it is interchangeable with any other bulb carrying the same designation regardless of manufacturer, provided the physical length and contact type match.
Festoon bulbs of differing lengths are not interchangeable even when voltage ratings match, as an incorrect length will either fail to make contact with the clips or create excessive pressure that can damage the housing.