INFINITI FX50 Back Up Light Bulb Size

The INFINITI FX50 back up light requires a 7440 bulb size for proper installation and function within the rear lighting assembly. Data for the specified component covers the range from 2009 through 2013.

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
2009-2013	7440

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament wedge bulb (T20). 12V, 21W.	7440

Other Locations

Additional Notes

The INFINITI FX50 uses the 7440 bulb size for the back up light across the 2009-2013 model years.
The 7440 is an ANSI-standardized bulb type, meaning its specifications are governed by a recognized North American standard applicable in both the United States and Canada.
The 7440 belongs to the T20 wedge bulb family, a form factor in which the base of the bulb itself acts as the connector, eliminating the need for a separate metal base or pins.
As a single-filament bulb, the 7440 is designed to perform one lighting function, which aligns with its dedicated role as a back up light.
The 7440 operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles.
The bulb carries a 21-watt rating, placing it in a moderate output range typical of incandescent reverse lights.
The T20 wedge base is a specific fitment type, and substituting a bulb with a different base configuration would result in an incompatible fit regardless of voltage or wattage similarity.