The INFINITI QX70 high beam and low beam headlight bulbs both utilize a D2S size. The replacement chart covers 2014 to 2017 model years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The D2S bulb is the sole bulb type specified for the INFINITI QX70 across all listed headlight positions and model years.
D2S is a high-intensity discharge (HID) bulb standard, operating through an electrical arc between two tungsten electrodes within a quartz glass capsule filled with xenon gas and metal halide salts.
The "D" prefix in D2S denotes a discharge-type bulb, while the "S" suffix indicates it is designed for use in projector-style headlight housings, as opposed to the "R" suffix used in reflector housings.
D2S bulbs operate at a nominal power of 35 watts and produce a color temperature typically in the range of 4,200 to 4,500 Kelvin, resulting in a white light with a slight blue tint compared to halogen sources.
Both the high beam and low beam positions on the QX70 (2014-2017) use the D2S bulb, meaning the same bulb type serves both functions, which is characteristic of projector systems that use a mechanical shutter to switch between beam patterns rather than separate bulbs.
D2S bulbs are not interchangeable with D2R bulbs despite sharing the same base and electrical specifications, as the internal arc tube coating differs and substituting one for the other produces incorrect light distribution within the housing.
The D2S standard includes an integrated igniter within the bulb body, distinguishing it from D1S and D3S types, where the igniter is either separate or built into the ballast.
Because D2S is an HID type, it requires a dedicated ballast to regulate the high-voltage startup pulse, typically around 23,000 volts, and the sustained operating voltage of approximately 85 volts AC.