International 4400LP Back Up Light Bulb Size

The International 4400LP back up light requires a 3157 bulb size for proper installation and function. Data for the specified component covers the range from 2011 to 2016.

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
2011-2016	3157

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.	3157

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Additional Notes

The International 4400LP uses the 3157 bulb for its back up light across the 2011-2016 model years.
The 3157 is an ANSI-standardized bulb type, meaning its physical and electrical specifications are governed by a recognized North American standard shared across the United States and Canada.
The 3157 is a dual-filament bulb, meaning it contains two separate filaments within a single housing, each operating at a different wattage.
The two filaments in the 3157 operate at 27W and 7W respectively, with the higher-wattage filament typically serving the brighter function and the lower-wattage filament serving a secondary function such as running or parking light duty.
The 3157 operates on a 12-volt electrical system, which is standard for most commercial and light-duty vehicles of this type.
The bulb follows the T25 form factor, a designation that refers to its wedge-style base and overall envelope shape.
Because the 3157 is a dual-filament type, single-filament substitutes such as the 3156 are not directly interchangeable without potential loss of one lighting function, even though they share the same base style.