The KYMCO Mongoose 300 headlight bulb uses an HS1 size for both high beam and low beam applications. The replacement chart covers 2010 to 2015 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 KYMCO Mongoose 300 uses the HS1 bulb type for both high beam and low beam headlight positions across the 2010-2015 model years.
The HS1 is a dual-filament halogen bulb, meaning a single bulb unit contains two separate filaments: one dedicated to the high beam function and one to the low beam function.
The HS1 operates at 12 volts with a wattage rating of 35W/35W, where the first value corresponds to the high beam filament and the second to the low beam filament.
The HS1 bulb is built to the ECE standard, a regulatory framework recognized across Europe and numerous other markets worldwide, governing performance and safety requirements for vehicle lighting.
The HS1 uses a PX43t base, which is a bayonet-style mount with a specific pin configuration designed for motorcycle headlight housings. This base type is not interchangeable with common automotive bulb bases such as H4, despite the H4 also being a dual-filament halogen type.
Because the HS1 and H4 share a similar dual-filament halogen design but differ in base configuration, substituting one for the other is not possible without modification to the socket or housing.