The KYMCO Grandvista headlight bulb uses HS1 size for both high beam and low beam functions. The replacement chart covers 2010 to 2011 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 is the sole bulb type specified across all listed positions and years for the KYMCO Grandvista, covering both high beam and low beam headlight functions in 2010-2011.
The HS1 is a dual-filament halogen bulb, meaning a single physical unit contains two separate filaments: one dedicated to high beam output and one to low beam output.
The HS1 operates at 12 volts and carries a 35W/35W power rating, where each value corresponds to one of the two filaments, both drawing equal wattage.
The HS1 uses a PX43t base, which is a bayonet-style fitting specific to motorcycle headlight applications. This base type is not interchangeable with common automotive bulb bases such as H4, despite the H4 sharing a similar dual-filament halogen design.
The HS1 is governed by ECE (Economic Commission for Europe) standards, a regulatory framework recognized across Europe and numerous other markets worldwide, distinguishing it from bulbs designed solely to DOT standards used in North America.