The Ferrari GTC4Lusso T high beam and low beam headlight bulbs both use D3S size bulbs. The replacement bulb chart covers 2018 to 2020 production years.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
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 for the Ferrari GTC4Lusso T across both high beam and low beam headlight positions for the 2018-2020 model years.
The D3S is a high-intensity discharge (HID) bulb that operates within a xenon gas-filled quartz arc tube, producing light through an electrical arc rather than a heated filament.
The "D" prefix in the D3S designation indicates the bulb is designed for use in projector-style headlight housings, which focus the arc discharge light through a lens system.
The "S" suffix in the D3S designation denotes that the bulb incorporates a UV-blocking quartz shroud around the arc tube, a feature required for use in housings with plastic lenses.
D3S bulbs operate at a nominal color temperature of approximately 4200K, producing a white light output with a slight blue-white appearance compared to halogen sources.
The D3S standard specifies a luminous flux of approximately 3200 lumens, which is substantially higher than the output of a typical halogen headlight bulb.
D3S bulbs require a dedicated ballast unit to generate the high-voltage ignition pulse and regulate the sustained operating current; the bulb is not compatible with standard 12V automotive circuits without this component.
The shared D3S fitment across both the high beam and low beam positions on the GTC4Lusso T indicates the vehicle uses a bi-xenon or dual-function projector system, where a single bulb type serves both lighting functions.
D3S bulbs are not interchangeable with D1S or D2S units despite sharing a similar physical form, as differences in the base connector and igniter configuration prevent cross-fitment.