Prevost X3 Coach headlight bulbs use H9 size for high beam and H9 or D2S size for low beam applications. The replacement chart covers 2007 through 2019 vehicle 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 Prevost X3 Coach uses the H9 bulb type for the high beam headlight across all listed model years, spanning 2007-2019.
The H9 is a halogen bulb operating at 65 watts with a PGJ19-5 base. It produces a high lumen output relative to its wattage, which suits high beam applications where maximum forward illumination is required.
The low beam headlight on the X3 Coach accommodates two distinct bulb types depending on the headlamp system installed: H9 for vehicles equipped with halogen capsule headlamps, and D2S for vehicles equipped with HID headlamps. This split applies across all listed model years from 2007-2019.
The D2S is a high-intensity discharge bulb with a rated output significantly higher than comparable halogen types. It operates through an arc discharge between two electrodes within a quartz capsule and requires a compatible ballast to function. The "S" designation indicates a projector-style housing is required, as opposed to the D2R variant designed for reflector housings.
Because the high beam position uses only the H9 across 2007-2019, HID technology on the X3 Coach is confined to the low beam position when the HID headlamp option is present.
The H9 and D2S bulbs are not interchangeable. They differ in operating voltage, base type, and required supporting hardware, meaning the correct replacement is determined strictly by which headlamp system the vehicle carries.
On X3 Coach units fitted with halogen capsule headlamps, the H9 serves both the high beam and low beam positions, making it the sole headlight bulb type for that configuration.
The D2S bulb uses a P32d-2 base and operates at approximately 35 watts, though it produces substantially more visible light than a halogen bulb of greater wattage due to the higher luminous efficacy of the discharge process.