The Hyosung GT250 headlight bulb uses a 9003 size for both high and low beam functions. The replacement chart covers 2007 to 2017 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 Hyosung GT250 uses the 9003 bulb type for both its high beam and low beam headlight positions across the 2007-2017 model years.
The 9003 is a dual-filament halogen bulb, meaning a single bulb contains two separate filaments: one rated at 60W for high beam output and one rated at 55W for low beam output.
Because both headlight positions share the same 9003 bulb type, a single bulb serves both functions within the same housing, which is a common arrangement in motorcycle headlight design.
The 9003 bulb operates on a 12V electrical system and uses a P43t base, which is a bayonet-style fitting with a 43mm flange used to seat and lock the bulb into its housing.
The 9003 designation follows the ANSI standard recognized in the United States and Canada. It is electrically and physically equivalent to the European H4 bulb type, though the two designations originate from different regional standards bodies.
The P43t base is not interchangeable with single-filament bases such as the P14.5s used by H1 or H7 bulbs, making socket compatibility a relevant factor when sourcing a replacement.