BMW 740iL Dome Light Bulb Size

The BMW 740iL dome light utilizes DE3423 and 6411 bulb sizes for the interior lighting components. Available data for the specified vehicle covers the range from 1995 through 2001.

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
1999-2001	DE3423
1995-1998	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 740iL dome light specifications cover model years 1995-2001 and reference two bulb sizes: DE3423 and 6411.
Both the DE3423 and 6411 are festoon-type bulbs, meaning they are cylindrical lamps held in place by tension between two end contacts rather than inserted into a socket.
The DE3423 is specified for the 1999-2001 740iL and measures 41mm in length with end-cap contacts, operating at 12 volts.
The 6411 is specified for the 1995-1998 740iL and measures 36mm in length with an SV8.5 base, rated at 12 volts and 5 watts.
The 5mm difference in length between the DE3423 (41mm) and the 6411 (36mm) means the two bulbs are not physically interchangeable, as festoon holders are sized to grip a specific bulb length.
The SV8.5 base designation on the 6411 refers to a single-contact festoon base with an 8.5mm cap width, which is a distinct contact configuration from the end-cap style used on the DE3423.
Both bulbs conform to ANSI standards applicable in the United States and Canada, indicating standardized electrical and dimensional tolerances within their respective size classes.