BMW 850i Dome Light Bulb Size

The BMW 850i dome light requires a 6411 bulb size for proper installation within the interior overhead lighting fixture. Data for the specific component covers the range from 1991 to 1992.

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
1993-1997	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 BMW 850i uses the 6411 bulb size for the dome light across all listed model years, spanning 1993-1997.
The 6411 is an ANSI-standardized bulb type, meaning it conforms to a defined specification recognized across the United States and Canada.
The 6411 is a festoon-style bulb, which is a cylindrical lamp that makes contact at both ends rather than through a screw or pin base.
The 6411 bulb measures 36mm in length, which is the contact-to-contact span relevant to fitment in the dome light housing.
It uses an SV8.5 base, a single-contact festoon base with a cap width of 8.5mm, which determines physical compatibility with the socket.
The 6411 operates at 12 volts and 5 watts, consistent with standard low-draw interior lighting in passenger vehicles.
Because festoon bulbs are sized by their length and base width, substituting a festoon bulb of a different length or base size would result in an improper fit in the BMW 850i dome light socket.