BMW 550i GT License Plate Bulb Size

The BMW 550i GT license plate light requires a unique bulb size identified as DE3423 for the rear exterior lighting assembly. Data for the specific component covers the range from 2010 through 2011.

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 Type	Shop
2010-2011	DE3423	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V.	DE3423	Check Price

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Additional Notes

The DE3423 is a festoon-type bulb, meaning it is cylindrical in shape and makes electrical contact through metal caps at each end rather than through a base socket.
The DE3423 follows the ANSI standard, which is the specification framework used across the United States and Canada, indicating a standardized form factor recognized throughout North American markets.
At 41mm in length, the DE3423 falls within the mid-range of common festoon bulb sizes, which typically span from 28mm to 44mm depending on application.
The bulb operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles.
The BMW 550i GT uses the DE3423 bulb for its license plate lighting across the 2010-2011 model years.