The Kawasaki KAF620 Mule 4000 uses HS1 bulb size for both high beam and low beam headlight applications. The replacement chart covers 2021 through 2022 vehicle production years with corresponding bulb size 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 listed across all headlight positions for the Kawasaki KAF620 Mule 4000, covering both the high beam and low beam functions for the 2021-2022 model years.
The HS1 is a dual-filament halogen bulb, meaning a single physical bulb contains two separate filaments, one serving the high beam function and one serving the low beam function.
The HS1 operates at 12 volts with a wattage rating of 35W per filament, giving it a balanced 35W/35W output across both filaments.
The HS1 uses a PX43t base, which is a bayonet-style fitting specific to this bulb type. This base design is not interchangeable with common automotive base types such as H4 or H7, despite the HS1 sharing a similar dual-filament halogen construction with those bulbs.
The HS1 is governed by ECE regulations, a lighting standard recognized across Europe and many other markets worldwide. This standard defines precise output and beam pattern requirements distinct from SAE standards used in North America.
Because the HS1 base and ECE beam pattern differ from SAE-compliant dual-filament bulbs, substituting a non-HS1 bulb risks both an improper physical fit and a non-conforming beam projection.