Lexus IS F Dome Light Bulb Size

The Lexus IS F dome light utilizes 6428 and DE3021 bulb sizes according to the provided specifications. Available information covers the period from 2008 through 2014 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
2014	DE3021
2011-2013	6428
2009-2010	DE3021
2008	6428

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 31mm length, end-cap contacts. 12V.	DE3021
ANSI standard (US & Canada). Festoon bulb, 36mm length, SV8.5 base. 12V, 5W.	6428

Other Locations

Additional Notes

The 6428 and DE3021 are the two festoon bulb types specified for the dome light of the Lexus IS F across its production years.
Both bulb types conform to ANSI standards applicable to the US and Canadian markets.
A festoon bulb is a cylindrical lamp that mounts horizontally between two end contacts, a format commonly used in automotive interior lighting applications.
The 6428 bulb has a 36mm length and uses an SV8.5 base, with a rated output of 12V and 5W.
The DE3021 bulb has a 31mm length and uses end-cap contacts rather than a dedicated base, operating at 12V.
The physical length difference between the two types, 31mm for the DE3021 and 36mm for the 6428, means the two bulbs are not interchangeable despite both being festoon-style lamps.
The 6428 is specified for the 2008 and 2011-2013 model years of the IS F.
The DE3021 is specified for the 2009-2010 and 2014 model years.
The SV8.5 base designation on the 6428 refers to a specific contact base width of 8.5mm, a detail relevant to socket fitment.