The Vespa LX 150 headlight bulb uses a 9003 size for both high and low beam functions. The replacement chart covers vehicle production years spanning 2005 to 2014 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 Vespa LX 150 uses the 9003 bulb size for both the high beam and low beam headlight positions across the 2005-2014 model range.
The 9003 is a dual-filament halogen bulb, meaning a single bulb unit contains two separate filaments to serve both the high beam and low beam functions simultaneously within one housing.
The 9003 bulb operates on a 12-volt electrical system and carries a wattage rating of 60W on the high beam filament and 55W on the low beam filament.
The 9003 uses a P43t base, which is a bayonet-style mount with a 43mm collar, and this base type determines physical fitment into the headlight socket.
The 9003 designation follows the ANSI standard used in the United States and Canada, making it distinct from the European ECE-regulated H4 bulb, which shares the same dual-filament halogen design and wattage ratings but carries a different certification marking.
Because the same bulb type is specified for both beam positions across all listed model years, a single 9003 bulb serves the full headlight assembly of the LX 150 rather than requiring separate bulbs for each beam function.