BMW Motorcycle K1100LT high beam and low beam headlight bulbs both utilize a 9003 size. The replacement chart covers vehicle production spanning 1993 to 1999.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The BMW Motorcycle K1100LT uses the 9003 bulb type for both high beam and low beam headlight positions across all model years from 1993-1999.
The 9003 is a dual-filament halogen bulb, meaning a single bulb unit contains two separate filaments to serve both high and low beam functions independently.
Despite the K1100LT having distinct high beam and low beam headlight positions, both positions share the same 9003 bulb specification, which is consistent with the dual-filament nature of the bulb.
The 9003 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 bulb follows the ANSI standard applicable in the United States and Canada, and it uses a P43t base, which is a bayonet-style mount with a 43mm flange.
The 9003 and H4 bulb types share the same physical form and P43t base, making them functionally interchangeable in many applications, though the 9003 designation reflects the North American ANSI standard while H4 reflects the European ECE standard.