The Piaggio Fly 150 uses a 9003 bulb size for both high beam and low beam headlight applications. The replacement chart covers vehicle production years spanning 2005 to 2019 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 9003 is the sole bulb type specified across all headlight positions in the Piaggio Fly 150 data. It is an ANSI-standard dual-filament halogen bulb rated at 12 volts, with a 60-watt filament for high beam and a 55-watt filament for low beam, mounted on a P43t base.
Because the 9003 carries two filaments within a single housing, it serves both the high beam and low beam functions in the Piaggio Fly 150 (2005-2019). A single bulb therefore handles both lighting modes rather than requiring separate units for each function.
The P43t base designation refers to a bayonet-style mount with a 43mm flange, which physically determines whether a bulb seats correctly in a given housing. A bulb with a different base type would not fit the socket regardless of its electrical rating.
The 9003 standard is defined by ANSI and is recognized in the United States and Canada. It is functionally equivalent to the international HB2 designation, meaning bulbs sold under either designation share the same electrical and physical specifications.
The 12-volt operating requirement of the 9003 aligns with the standard electrical system voltage found in most small-displacement motor scooters, making it a compatible fit for the Fly 150's charging and battery architecture.
The consistent use of the 9003 across the 2005-2019 model range indicates that the headlight housing design remained unchanged over that period, which has a direct bearing on parts interchangeability between those model years.