The Lamborghini Diablo high beam headlight uses a 9005 or 9003 bulb size, while the low beam headlight requires a 9006 or 9003 bulb size. The replacement chart covers vehicle production years spanning 1990 to 2001 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 9003 bulb is the most widely used type across the Lamborghini Diablo headlight specifications, appearing in both high beam and low beam positions for the 1990-1998 model years. It is a dual-filament halogen bulb rated at 12V with a P43t base, drawing 60W on high beam and 55W on low beam.
Because the 9003 carries both filaments within a single unit, it serves high and low beam functions simultaneously in a single-bulb headlight system, which accounts for its use in both sub-parts during the 1990-1998 period on the Diablo.
The 1999-2001 Lamborghini Diablo uses a split-bulb headlight arrangement, with the 9005 assigned to the high beam position and the 9006 to the low beam position. Each of these is a single-filament halogen bulb, meaning each handles only one lighting function.
The 9005 operates at 12V and 65W with a P20d base, while the 9006 operates at 12V and 55W with a P22d base. Although both are single-filament halogen types, their bases differ and the two bulbs are not interchangeable with each other.
The P43t base of the 9003 is physically distinct from both the P20d base of the 9005 and the P22d base of the 9006, making cross-substitution between the 9003 and either of the other two types mechanically incompatible.
All three bulb types listed in the Diablo specifications conform to ANSI standards applicable in the United States and Canada, indicating a standardized electrical and physical interface within those markets.
The transition from the 9003 dual-filament arrangement to separate 9005 and 9006 single-filament bulbs occurred between the 1998 and 1999 model years of the Diablo, reflecting a change in headlight assembly design.
The wattage difference between the 9005 high beam at 65W and the 9006 low beam at 55W follows the general convention in split-bulb systems where the high beam filament draws more power to produce greater output.