The 9005 bulb type is specified for both the high beam and low beam headlight positions across all listed model years of the Ducati 999, covering the 2003-2006 range.
The 9005 is a single-filament halogen bulb operating at 65 watts, designed for high-intensity forward lighting applications.
The 9005 belongs to the P20d base family and is standardized under the SAE and ANSI bulb classification systems, giving it broad cross-manufacturer availability.
The use of the same bulb type for both high beam and low beam positions on the Ducati 999 indicates a dual-reflector or dual-housing headlight arrangement rather than a single dual-filament unit.
The 9005 is not interchangeable with the 9006, which shares a physically similar housing but uses a different base tab configuration specifically designed to prevent cross-fitment.
Although the 9005 and H10 bulbs share the same wattage and base type, they are not always rated identically in terms of color temperature and beam pattern, and substitution between them is not confirmed by these specifications.
The consistent 9005 fitment across the 2003-2006 model years of the Ducati 999 indicates no headlight system revision occurred within that production span.