Jaguar XJ6 Dome Light Bulb Size

The Jaguar XJ6 dome light utilizes bulb size 6411 and bulb size DE3423 for interior illumination. Available data covers the range from 1972 through 1997 for the specified vehicle components.

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
1980-1997	6411
1972-1979	DE3423

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 36mm length, SV8.5 base. 12V, 5W.	6411
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V.	DE3423

Other Locations

Additional Notes

The Jaguar XJ6 dome light uses two festoon bulb types across its model years: the 6411 for 1980-1997 and the DE3423 for 1972-1979.
A festoon bulb is a cylindrical lamp that mounts horizontally between two spring-loaded contacts or end caps, a form factor common in interior dome and map light applications.
The 6411 is an ANSI-standard bulb rated at 12 volts and 5 watts, with a 36mm body length and an SV8.5 base, which uses a metal collar around the bulb's midsection as its mounting and contact point.
The DE3423 is also an ANSI-standard bulb rated at 12 volts, with a 41mm body length and end-cap contacts, meaning electrical contact is made at both ends of the bulb rather than through a side collar.
The 6411 and DE3423 are not interchangeable despite both being festoon-type bulbs, as they differ in length by 5mm and use incompatible contact configurations.
The SV8.5 base of the 6411 is a standardized designation indicating the base style and nominal width, which determines physical fitment within the socket housing.
The wattage of the DE3423 is not specified in the provided data, whereas the 6411 is explicitly rated at 5 watts.
Both bulb types conform to ANSI standards applicable in the United States and Canada, indicating they meet a defined set of dimensional and electrical tolerances for those markets.