Triumph Legend TT headlight bulbs utilize a 9003 size for both high and low beam functions. Replacement chart data spans 1999 to 2002 model years with corresponding bulb 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 for the Triumph Legend TT, covering model years 1999-2002.
The 9003 is a dual-filament halogen bulb, meaning a single unit contains two separate filaments to serve both high and low beam functions within one housing.
Because the 9003 serves both the high beam and low beam positions on the Triumph Legend TT, both positions draw from the same bulb type, making the two positions interchangeable in terms of the physical bulb used.
The 9003 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 standardized bayonet-style fitting with a 43mm collar, and only bulbs sharing this base type are physically compatible with the socket.
The 9003 designation is an ANSI standard recognized in the United States and Canada. It is functionally equivalent to the international HB2 designation, though the two designations originate from different standardization bodies and packaging labeled under either name refers to the same bulb.