The Triumph Rocket 3 GT headlight bulb uses a 9003 size for both high beam and low beam applications. The replacement chart covers 2022 to 2023 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 is the sole bulb type across all listed positions and years for the Triumph Rocket 3 GT, appearing in both the high beam and low beam headlight sockets for the 2022-2023 model years.
The 9003 is a dual-filament halogen bulb, meaning a single unit contains separate filaments for two distinct light output levels rather than requiring two separate bulbs.
The 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 three-pronged bayonet-style mount that physically determines socket compatibility and prevents incorrect bulb installation.
The 9003 designation follows the ANSI standard as used in the United States and Canada, and it is electrically and physically equivalent to the H4 designation used under European and international standards, making cross-reference between the two designations applicable for fitment purposes.