The Triumph Trophy high beam and low beam headlight bulbs both utilize a 9003 size. Replacement bulb specifications for this motorcycle span from 1995 through 2003 in the chart.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Triumph Trophy uses the 9003 bulb type for both high beam and low beam headlights across the 1995-2003 model years.
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 within one housing.
The 9003 operates at 12 volts 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 housing.
The 9003 designation is an ANSI standard recognized in the United States and Canada. It is electrically and functionally equivalent to the European H4 bulb, though the two designations originate from different standardization bodies.
Because the 9003 and H4 share the same dual-filament configuration, P43t base, and 12V/60W/55W ratings, they are widely regarded as interchangeable in practice, though fitment should be confirmed against the specific housing before substitution.