Jaguar XJ8 Dome Light Bulb Size

The Jaguar XJ8 dome light requires a 6411 bulb size for proper installation and function within the interior overhead lighting assembly. Available data covers the period from 2004 through 2009 for the specified vehicle and 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
2004-2009	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 Jaguar XJ8 uses the 6411 bulb for the dome light across the 2004-2009 model years.
The 6411 is classified as a festoon bulb, a cylindrical form factor that mounts by pressing its end caps into spring clips rather than inserting into a socket.
The 6411 bulb follows the ANSI standard, meaning the specification is recognized across the United States and Canada.
The bulb operates at 12 volts and 5 watts, consistent with standard low-power interior lighting in passenger vehicles.
The SV8.5 base designation refers to the metal end cap size, with 8.5mm indicating the cap width used to seat the bulb within its retaining clips.
The 36mm length is a critical fitment factor, as festoon bulbs must physically span the housing to make contact at both ends.
Substituting a festoon bulb of a different length, such as 31mm or 41mm, would result in either a loose fit or an inability to seat properly in the dome light housing.