The Triumph Thunderbird Storm high beam and low beam headlight bulbs both utilize a 9003 bulb size. The replacement chart covers vehicle production spanning 2011 to 2017.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Triumph Thunderbird Storm uses the 9003 bulb type for both high beam and low beam headlight positions across the 2011-2017 model years.
The 9003 is a dual-filament halogen bulb, meaning a single bulb contains two separate filaments to serve both the high 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 fitment requires a bulb with this specific base type to seat correctly.
The 9003 is an ANSI-standardized bulb recognized in the United States and Canada, and it is functionally equivalent to the European H4 standard, though packaging and labeling may differ by market.
Because the same 9003 bulb size is specified for both the high beam and low beam positions, a single replacement bulb type services both functions on the Thunderbird Storm.