The KTM 500 EXC high beam and low beam headlight bulbs both utilize the HS1 size, designated as 6235B bulb specification. The replacement chart covers 2012 through 2016 production years with corresponding bulb size data.
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 a dual-filament halogen unit operating at 12V with a 35W rating on both filaments, built to the ECE standard used across Europe and worldwide markets. Its base type is PX43t, a bayonet-style fitting specific to motorcycle headlight applications.
The KTM 500 EXC uses the HS1 bulb for both high beam and low beam headlight positions across the 2014-2016 model years, meaning a single bulb type serves both beam functions simultaneously through its dual-filament construction.
Because the HS1 is a dual-filament bulb, both the high beam and low beam functions are housed within one physical unit rather than separate bulbs, which is a common configuration in motorcycle headlight assemblies.
The 6235B is an ANSI-standard festoon bulb with blue-tinted glass, rated at 12V and classified as a specialty application bulb. The ANSI standard applies primarily to the US and Canadian markets.
The 500 EXC (2012-2013) uses the 6235B for both high beam and low beam positions, indicating a different headlight housing design compared to the 2014-2016 configuration that accepts the HS1.
The HS1 and 6235B are not interchangeable. The HS1 uses a PX43t bayonet base while the 6235B is a festoon-type bulb, and the two also conform to different international standards, making direct substitution between the two model year groups incompatible.