BMW L7 Dome Light Bulb Size

The BMW L7 dome light requires a bulb size of 6411 for the interior lighting system. Data for the specific component covers the range from 1986 to 1987.

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
1986-1987	6411

Bulb Specifications

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

Other Locations

Additional Notes

The 6411 is the sole bulb type listed for the BMW L7 dome light across both available model years, 1986-1987.
The 6411 follows the ANSI standard, meaning it conforms to a specification set jointly recognized in the United States and Canada.
It is a festoon-style bulb, a form factor characterized by a cylindrical lamp body with end caps that seat into spring-loaded holders rather than a twist or plug-in socket.
The bulb measures 36mm in length, which is the critical fitment figure for festoon bulbs, as the holder span must match this value for proper contact and retention.
The base type is SV8.5, referring to the diameter of the end caps in millimeters, which must correspond to the socket width in the vehicle's fixture.
The 6411 operates at 12 volts and 5 watts, consistent with standard low-draw interior lighting in automotive applications of that era.
Because festoon bulbs are sized by both length and cap width, substituting a festoon bulb of a different length or a different base designation would result in an improper fit even if the voltage and wattage ratings matched.