The Gas Gas EC headlight bulb uses an HS1 size for both high beam and low beam functions. The replacement chart covers 2005 to 2012 production years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The HS1 bulb type is specified for both the high beam and low beam headlight positions on the Gas Gas EC across the 2005-2012 model years covered in these specifications.
The HS1 is a dual-filament halogen bulb, meaning a single bulb unit contains separate filaments for both high and low beam functions, operating at 12 volts with a 35W rating on each filament.
The HS1 uses a PX43t base, which is a bayonet-style fitting specific to motorcycle applications and is not interchangeable with automotive headlight bases such as H4, despite the H4 also being a dual-filament halogen type.
The HS1 is built to ECE standards, a regulatory framework recognized across Europe and numerous other markets worldwide, governing output, beam pattern, and construction requirements.
Because the Gas Gas EC uses the same HS1 specification for both the high beam and low beam positions, a single bulb type serves the entire headlight assembly rather than requiring separate bulb types for each function.
The equal 35W/35W output across both filaments distinguishes the HS1 from some other dual-filament motorcycle bulbs that carry asymmetric wattage ratings between their high and low beam filaments.