BMW 325i Dome Light Bulb Size

The BMW 325i dome light requires bulb sizes DE3423 and 6411 depending on the specific version of the vehicle being serviced for interior lighting needs. Available information covers the time range from 1988 through 2006 for the various components listed in the provided data set.

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
2001-2006	DE3423
1993-1995	6411
1988-1991	6411

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V.	DE3423
ANSI standard (US & Canada). Festoon bulb, 36mm length, SV8.5 base. 12V, 5W.	6411

Other Locations

Additional Notes

The BMW 325i uses two distinct dome light bulb sizes across its model years: the DE3423 for 2001-2006 and the 6411 for 1988-1995.
Both the DE3423 and 6411 are festoon-type bulbs, meaning they are cylindrical in shape and mount by pressing between two spring-clip contacts at either end of the fixture.
Both bulb types conform to ANSI standards applicable in the United States and Canada.
Both bulbs operate on a 12-volt electrical system, consistent with standard automotive applications.
The DE3423 has a length of 41mm and uses end-cap contacts as its mounting interface.
The 6411 has a length of 36mm and uses an SV8.5 base, making it physically shorter than the DE3423 by 5mm.
The SV8.5 designation on the 6411 refers to a festoon base with an 8.5mm contact width, a detail that distinguishes it from other festoon bulbs of similar length.
The 6411 carries a rated wattage of 5W, while no wattage rating is listed for the DE3423.
Because the DE3423 and 6411 differ in length and base type, the two bulbs are not interchangeable across model year groups of the BMW 325i.