The BMW Motorcycle G450X headlight bulb uses HS1 size for both high beam and low beam functions. The replacement chart covers 2008 to 2010 production 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 BMW Motorcycle G450X uses the HS1 bulb type across all three model years (2008-2010) for both high beam and low beam headlight positions.
The HS1 is a dual-filament halogen bulb, meaning a single bulb unit contains separate filaments for both high and low beam functions within one housing.
The HS1 operates at 12 volts with a 35W/35W output rating, where both filaments draw equal wattage regardless of which beam is active.
The HS1 uses a PX43t base, which is a bayonet-style fitting specific to motorcycle headlight applications and is not interchangeable with common automotive bulb bases such as H4.
The HS1 is built to the ECE standard, a regulatory framework recognized across Europe and numerous other markets worldwide, governing output, beam pattern, and construction requirements.
Because the G450X uses a single HS1 bulb to serve both the high beam and low beam positions, replacing one effectively addresses both functions simultaneously.