Aston Martin DB9 high beam and low beam headlight bulbs both utilize the D1S size. The replacement chart covers vehicle production spanning 2005 to 2016.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Aston Martin DB9 uses the D1S bulb type for both high beam and low beam headlights across all model years from 2005-2016.
The D1S is a high-intensity discharge (HID) bulb, which operates by passing an electrical arc between two tungsten electrodes within a quartz glass capsule filled with xenon gas and metal halide salts.
As an HID bulb, the D1S produces light output significantly greater than a standard halogen bulb while consuming less power, typically operating at around 35 watts with a color temperature near 4200K.
The "S" designation in D1S indicates the bulb has a shroud, a small shield built into the bulb body that prevents stray light from causing glare, making it suitable for use in projector-style headlight housings.
Because both the high beam and low beam positions use the D1S across the full 2005-2016 production span of the DB9, the vehicle relies on a single bulb type to serve both functions, which is characteristic of bi-xenon headlight systems.
The D1S bulb integrates its igniter directly into the bulb unit, distinguishing it from D2S bulbs, which require a separate external igniter. This integration means the D1S is not interchangeable with D2S bulbs despite their similar appearance and function.
D1S bulbs operate at high voltages, typically around 85 volts during steady-state operation, generated by a ballast unit. The ballast is a separate component from the bulb itself and is part of the vehicle's headlight assembly.
Because the D1S specification is consistent across all listed years of the DB9, a bulb sourced for a 2005 model is technically the same size as one for a 2016 model, though housing and ballast compatibility across model years is a separate consideration not addressed by bulb size alone.