The Triumph Daytona 955i headlight bulb uses a 9003 size for both high and low beam functions. The replacement chart covers vehicle production spanning 1999 to 2006.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Triumph Daytona 955i uses the 9003 bulb type for both high beam and low beam headlights across all listed model years from 1999-2006.
The 9003 is a dual-filament halogen bulb, meaning a single bulb unit contains two separate filaments: one rated at 60W for high beam operation and one rated at 55W for low beam operation.
Because both the high beam and low beam positions share the same 9003 specification on the Daytona 955i, a single bulb type serves both lighting functions from one housing.
The 9003 bulb operates on a 12V electrical system and uses a P43t base, which is a bayonet-style fitting with a 43mm collar used to locate and secure the bulb within the headlight housing.
The 9003 designation is an ANSI standard recognized in the United States and Canada. It is functionally equivalent to the H4 bulb type used under European and international standards, though the designations originate from different standardization bodies.
The H4 and 9003 types are widely considered interchangeable in practice, but fitment should be confirmed against the specific housing design of the Daytona 955i before substitution, as base tolerances can vary between manufacturers.