The KYMCO Downtown 300i headlight bulb uses H8 and HS1 sizes for both high beam and low beam applications, with bulb specifications varying across model iterations. The replacement chart covers 2011 through 2017 production years and documents the corresponding bulb size requirements for each model year.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The KYMCO Downtown 300i lists two accepted bulb types for both the high beam and low beam headlight positions across all model years from 2011-2017: the H8 and the HS1.
The H8 is a single-filament halogen bulb rated at 12V and 35W, fitted with a PGJ19-1 base, and carries ECE approval for use in Europe and worldwide markets, with additional approval in the United States.
The HS1 is a dual-filament halogen bulb rated at 12V with 35W on each filament, fitted with a PX43t base, and is designed specifically for motorcycle applications under the ECE standard.
Because the H8 uses a PGJ19-1 base and the HS1 uses a PX43t base, the two bulb types are not physically interchangeable despite sharing the same voltage rating and single-filament wattage figure.
The HS1 carries two filaments within a single envelope, a design intended to serve both high and low beam functions from one bulb in motorcycle headlight assemblies, whereas the H8 serves only a single lighting function per bulb.
The presence of both H8 and HS1 listings for each headlight position across all recorded years suggests the Downtown 300i may have been produced with headlight assemblies compatible with either base type, depending on the specific unit.
Both bulb types conform to ECE regulations, meaning they meet the photometric and safety standards applied to vehicle lighting across European and many international markets.