Arctic Cat 366 headlight bulbs utilize HS1 size for both high and low beam functions. The replacement chart covers 2008 to 2011 vehicle production years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The HS1 bulb is the sole bulb type specified across all listed positions for the Arctic Cat 366, covering both high beam and low beam headlights for the 2008-2011 model years.
The HS1 is a dual-filament halogen bulb, meaning a single bulb unit contains separate filaments for two distinct light output levels rather than requiring individual single-filament bulbs for each function.
The HS1 operates at 12 volts with a 35W/35W power rating, where both filament values are equal, distinguishing it from asymmetric dual-filament types where high and low beam wattages differ.
The HS1 uses a PX43t base, which is a specific bayonet-style fitting. Bulbs with visually similar envelopes but different base types are not interchangeable with this fitment.
The HS1 is governed by ECE regulations, a lighting standard recognized across Europe and numerous other markets worldwide, as opposed to SAE standards used primarily in North America.
Because the HS1 serves both the high beam and low beam positions on the Arctic Cat 366, a single replacement bulb type addresses both headlight functions on this vehicle.