The Nissan 370Z uses the D2S bulb type across both its high beam and low beam headlight positions for the 2009-2020 model years.
The D2S is a High-Intensity Discharge (HID) bulb, meaning it produces light through an electrical arc between two tungsten electrodes rather than through a heated filament.
D2S bulbs operate with a ballast, which is a separate control unit that regulates the high voltage required to ignite and sustain the arc inside the bulb.
The "S" designation in D2S indicates the bulb is designed for use in projector-style headlight housings, which use a lens and reflector system to focus and shape the light beam.
Because both the high beam and low beam positions in the 370Z share the same D2S specification, the projector housing controls beam switching internally rather than relying on separate bulbs for each function.
D2S bulbs are not interchangeable with D2R bulbs despite sharing the same base type. The D2R variant is designed for reflector housings and has a painted band around the arc tube to prevent glare, which would interfere with a projector housing's optical performance.
The D2S standard produces a color temperature typically in the range of 4200K to 6000K depending on the manufacturer, which places its output in the white-to-blue-white range of the visible spectrum.
HID systems such as those using D2S bulbs generally produce significantly more luminous output than halogen systems while consuming less wattage, with D2S bulbs commonly rated at 35 watts.