Lincoln Mark LT Back Up Light Bulb Size

The Lincoln Mark LT back up light utilizes bulb size 3156 or 2456 depending on the specific version of the vehicle. Data for the lighting components covers the range from 2006 through 2008.

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
2008	3156
2006-2007	2456

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament wedge bulb (T25). 12V, 27W.	3156
ANSI standard (US & Canada). Festoon bulb, specialty application. 12V.	2456

Other Locations

Additional Notes

The Lincoln Mark LT uses two distinct bulb types across its model years for the back up light position: the 3156 and the 2456.
The 3156 is an ANSI-standard single-filament wedge bulb classified under the T25 form factor, rated at 12 volts and 27 watts.
The 2456 is an ANSI-standard festoon bulb intended for specialty applications, rated at 12 volts.
Festoon bulbs differ from wedge bulbs in their physical mounting style, using end caps rather than a wedge base, which makes the two types physically incompatible with each other.
The Lincoln Mark LT (2006-2007) takes the 2456 festoon bulb for the back up light.
The 2008 model year shifted to the 3156 wedge bulb, meaning the socket type in the 2008 vehicle differs from that of the two preceding years.
Because the 3156 and 2456 use different base configurations, a bulb from a 2006 or 2007 Mark LT is not a direct fit for the 2008 model, and vice versa.
Both the 3156 and 2456 conform to ANSI standards recognized in the United States and Canada.