The Vespa GTV 250 headlight bulb uses a 9003 size for both high and low beam functions. The replacement chart covers 2007 to 2010 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 9003 bulb is the sole bulb type specified across all headlight positions on the Vespa GTV 250 for the 2007-2010 model years.
The 9003 is an ANSI-standard designation used in the United States and Canada, identifying a dual-filament halogen bulb with a P43t base rated at 12 volts and 60W/55W output.
The dual-filament design of the 9003 allows a single bulb to serve both high beam and low beam functions, with the 60-watt filament dedicated to high beam and the 55-watt filament to low beam.
Because the Vespa GTV 250 uses the same 9003 bulb for both the high beam and low beam headlight positions, only one bulb type is required to service the entire headlight assembly.
The 9003 shares its physical form and P43t base with the H4 bulb, which is the international designation for the same lamp type, making H4-labeled bulbs generally interchangeable with 9003-labeled bulbs in this application.