Harley-Davidson XL1200L Sportster 1200 Low uses a 9003 bulb size for both high beam and low beam headlight applications. The replacement chart covers 2006 through 2011 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 specified for both the high beam and low beam headlight positions on the Harley-Davidson XL1200L Sportster 1200 Low across the 2006-2011 model years.
The 9003 is a dual-filament halogen bulb, meaning a single bulb unit contains two separate filaments: one rated at 60W for high beam output and one rated at 55W for low beam output.
Because the 9003 serves both beam functions within one bulb, the high beam and low beam headlight positions on this motorcycle share an identical part number rather than requiring two distinct bulb types.
The 9003 operates on a 12V electrical system, which is standard for motorcycle applications of this type.
The bulb uses a P43t base, a bayonet-style fitting with a 43mm flange that physically locks the bulb into the headlight housing.
The 9003 designation follows the ANSI standard used in the United States and Canada. It is functionally equivalent to the H4 bulb used under international IEC standards, though fitment compatibility between the two designations depends on the specific housing design.