Evobus S 417 high beam headlight uses H1 bulb size and low beam headlight uses H7 bulb size. Replacement chart covers 2003 to 2018 vehicle production years with bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Evobus S 417 uses the H1 bulb type for the high beam headlight across all documented model years from 2003-2018.
The H1 is a single-filament halogen bulb operating at 55 watts with a P14.5s single-pin base, designed to produce a focused, long-range beam pattern suited to high beam applications.
The low beam headlight on the Evobus S 417 uses the H7 bulb type across all documented model years from 2003-2018.
The H7 is a single-filament halogen bulb rated at 55 watts with a PX26d two-pin base. Its filament position and internal shield produce a controlled, asymmetric beam pattern that reduces glare for oncoming traffic, which is characteristic of low beam use.
The H1 and H7 are not interchangeable with each other. Their base configurations differ fundamentally, with the H1 using a single center pin and the H7 using a two-pin bayonet-style base, making physical substitution between the two impossible without modification.
Both the H1 and H7 bulb types conform to ECE (Economic Commission for Europe) regulations, which govern bulb geometry, light output, and color temperature standards for road use in many markets.
The consistent use of H1 for high beam and H7 for low beam across the full 2003-2018 model range indicates that the S 417 headlight housing was designed around a dual-bulb reflector system rather than a projector or single-bulb configuration.
Because the H1 and H7 share the same 55-watt power rating, the electrical load on the vehicle's lighting circuit is equal for both headlight functions, though the two circuits remain separate due to the differing base types.