BMW 735i Dome Light Bulb Size

The BMW 735i dome light requires a 6411 bulb size for proper illumination within the interior cabin area. Data for the specific bulb requirements covers the range from 1985 to 1986.

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
1985-1986	6411

Bulb Specifications

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

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Additional Notes

The 6411 is the dome light bulb size for the BMW 735i across the 1985-1986 model years.
The 6411 bulb follows the ANSI standard, which is the designation system used in the United States and Canada for standardized lamp types.
It is a festoon-style bulb, meaning it is cylindrical in shape with metal end caps that make contact with spring-loaded holders on each end of the fixture, rather than using a traditional screw or bayonet base.
The bulb measures 36mm in length, which is the span between its two end contacts and determines physical fitment within the dome light housing.
It uses an SV8.5 base, a designation that refers to the diameter of the end caps in millimeters, specifically 8.5mm, which must match the socket to seat correctly.
The 6411 operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles of this era.
Its rated wattage is 5W, placing it in the low-power range typical of interior courtesy lighting applications.