Polaris Sportsman 850 Tail Light Bulb Size

The Polaris Sportsman 850 tail light uses a 3157 bulb size for replacement purposes. The replacement chart covers vehicle production spanning 2015 to 2019.

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
2015-2019	3157

Bulb Specifications

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

Other Locations

Additional Notes

The 3157 is the specified tail light bulb for the Polaris Sportsman 850 across the 2015-2019 model years.
The 3157 is a dual-filament bulb, meaning it contains two separate filaments within a single envelope. One filament operates at 27W for braking or turn signal functions, while the other operates at 7W for running light functions.
The 3157 follows the ANSI standardized designation, which is recognized across the United States and Canada, making it widely available through North American parts suppliers.
The bulb uses a T25 wedge base, a bayonet-style fitting that locks into the socket with a twist. The T25 designation refers to the tubular glass envelope width, measured in eighths of an inch.
The 3157 operates on a 12V electrical system, consistent with standard automotive and powersports vehicle architecture.
The dual-filament design of the 3157 means it is not directly interchangeable with single-filament variants such as the 3156, even though those bulbs share a physically similar base. Substituting a single-filament bulb would result in the loss of one lighting function.