Ferrari GTC4Lusso high beam and low beam headlight bulbs both use D3S size replacement bulbs. The chart contains bulb size specifications covering the 2017 to 2020 production range.
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 Ferrari GTC4Lusso uses the D3S bulb type for both high beam and low beam headlights across the 2017-2020 model years.
The D3S 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.
The "D" prefix in the D3S designation indicates that the bulb contains its own integrated igniter, meaning it does not require a separate starter component within the ballast system.
The "S" suffix in the D3S designation specifies that the bulb is housed in a quartz glass envelope, as opposed to the "R" suffix variants, which use a partially coated envelope designed for projector-style reflector housings.
Because the GTC4Lusso shares the same D3S specification for both high and low beam functions across all listed model years, the vehicle relies on a single bulb type to serve dual lighting roles, typically achieved through a movable shield or projector lens mechanism within the headlight assembly.
The D3S bulb operates at a standard HID system voltage of 42 volts during steady-state operation, following an initial high-voltage ignition pulse that can reach several kilovolts.
D3S bulbs are not interchangeable with D1S or D2S variants despite sharing a similar physical form, as differences in the igniter configuration and electrical contacts make cross-type substitution incompatible without modification.