The Triumph TT600 headlight bulb uses a 9003 size for both high beam and low beam functions. The replacement chart covers 2000 to 2003 model 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 Triumph TT600, covering model years 2000-2003.
The 9003 is a dual-filament halogen bulb, meaning a single unit contains both the high beam and low beam filaments within one glass envelope.
The 9003 operates on a 12-volt electrical system and draws 60 watts on the high beam filament and 55 watts on the low beam filament.
The 9003 uses a P43t base, which is a standardized bayonet-style fitting with a 43mm flange width, governing physical compatibility with the headlight housing.
The 9003 designation follows the ANSI standard used in the United States and Canada, making it the North American classification for this bulb type.
The 9003 is electrically and physically equivalent to the H4 bulb used under European and international standards, though the designations differ by market.
Because the same 9003 bulb serves both the high beam and low beam positions on the Triumph TT600, a single replacement bulb type addresses both functions simultaneously.