ECE standard (Europe & worldwide). Mercury-free HID (xenon) discharge bulb with PK32d-5 base and integral ignitor, for projector-type housings. 42V, 35W.
The D3S is the sole bulb type specified across all headlight positions in the Jaguar F-Type, appearing in both high beam and low beam roles for the 2014-2021 model years covered by these specifications.
The D3S is a High-Intensity Discharge (HID) xenon bulb, meaning it produces light by passing an electrical arc through xenon gas rather than heating a filament, which is the operating principle that distinguishes it from halogen and incandescent types.
The bulb operates at 42 volts and 35 watts, a voltage level far above standard automotive 12V systems, requiring a dedicated ballast to step up and regulate the supply before the arc can be struck and sustained.
An integral ignitor is built directly into the D3S unit, combining the high-voltage starting component and the burner into a single assembly, which affects how the bulb is handled and replaced compared to types where the ignitor is a separate component mounted on the housing.
The D3S carries the PK32d-5 base designation, a keyed single-ended base format that physically prevents substitution with other HID types such as the D1S or D2S, which use different base configurations despite sharing a similar general form.
The D3S is specified to the ECE standard, a regulatory framework recognized across Europe and numerous other markets worldwide, meaning the bulb's output, color temperature, and beam pattern conform to those internationally harmonized requirements.
The D3S is formulated without mercury, distinguishing it from earlier HID types such as the D2S, a difference that carries implications for disposal classification under environmental regulations in various jurisdictions.
The specification of D3S for projector-type housings indicates the Jaguar F-Type's headlight assemblies use a projector optical system, which focuses the HID arc through a lens to produce a controlled beam pattern, as opposed to reflector housings that distribute light differently and are generally incompatible with this bulb type.