The Hyosung ST7 uses a 9003 bulb size for both high beam and low beam headlight applications. The replacement chart covers vehicle production spanning 2010 to 2016 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 Hyosung ST7 uses the 9003 bulb type across all listed model years (2010-2016) for both high beam and low beam headlight positions.
The 9003 is an ANSI-standard bulb designation recognized in the United States and Canada, making it a widely available halogen type in the North American market.
A dual-filament design allows the 9003 to serve both high and low beam functions within a single bulb, which is why the ST7 uses the same bulb size for both headlight positions.
The 9003 operates on a 12-volt electrical system and carries a wattage rating of 60W for the high beam filament and 55W for the low beam filament.
The P43t base is the mounting interface of the 9003 bulb, a bayonet-style base that determines physical fitment into the headlight housing.
The 9003 shares its electrical and filament specifications with the H4 bulb type, though the two differ in base configuration, meaning they are not directly interchangeable despite similar performance ratings.