KTM 250 XC-W high beam and low beam headlight bulbs both utilize HS1 size bulbs, designated as 6235B. The replacement chart covers 2008 to 2018 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 HS1 bulb type is the most frequently referenced across the specifications, appearing in both high beam and low beam positions for the KTM 250 XC-W across the 2014-2018 model years.
The HS1 is a dual-filament halogen bulb operating at 12V with a 35W/35W output rating, meaning a single bulb serves both the high and low beam functions through two separate filaments within one housing.
The HS1 uses a PX43t base, a bayonet-style fitting specific to motorcycle applications, which is not interchangeable with common automotive bulb bases such as H4 despite similar dual-filament functionality.
The HS1 conforms to ECE standards, a regulatory framework recognized across Europe and numerous other markets worldwide, governing output, beam pattern, and construction requirements.
The 6235B bulb type is specified for both the high beam and low beam positions on the 250 XC-W for model years 2008-2013, and it is classified as a festoon-style bulb with blue tinted glass under the ANSI standard applicable to the US and Canadian markets.
The 6235B operates at 12V and is designated as a specialty application bulb, indicating it is not a general-purpose replacement type and may have limited cross-compatibility with other bulb families.
A transition in bulb type occurs between the 2013 and 2014 model years on the KTM 250 XC-W, shifting from the ANSI-classified 6235B festoon format to the ECE-classified HS1 dual-filament halogen format in both beam positions.
Because the 6235B and HS1 differ in base type, filament configuration, and regulatory standard, the two bulb types are not interchangeable with one another across the model year split.