Audi Coupe Dome Light Bulb Size

The Audi Coupe dome light requires a 6411 bulb size for interior illumination. Available data covers the manufacturing span from 1981 through 1987 for the specified lighting component.

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
1981-1987	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 dome light bulb size specified for the Audi Coupe across all listed model years, spanning 1981-1987.
The 6411 bulb follows the ANSI standard, meaning it conforms to a specification recognized across the United States and Canada.
It is a festoon-type bulb, a cylindrical form factor that mounts by pressing its end caps into spring clips rather than using a screw or bayonet base.
The bulb measures 36mm in length, which is a critical fitment factor, as festoon bulbs must match the exact span of the fixture's clip contacts.
The 6411 uses an SV8.5 base, a designation that refers to the diameter of the end caps on a festoon bulb, in this case 8.5mm.
It operates at 12 volts and draws 5 watts, consistent with standard low-power interior lighting in 12-volt automotive electrical systems.
Because festoon bulbs are sized by both length and base type, substituting a 6411 with a festoon bulb of a different length or base size would result in an improper fit in the Audi Coupe's dome light fixture.