INFINITI QX50 high beam headlight bulbs use H9 size, while low beam headlight bulbs use H11 or D2S size. The replacement chart covers 2014 to 2017 vehicle production 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 INFINITI QX50 uses the H9 bulb for the high beam headlight across the 2014-2017 model years. The H9 is a halogen bulb operating at 65 watts with a PGJ19-5 base, designed for high-intensity forward projection.
Two distinct low beam configurations exist for the QX50 across the 2014-2017 model years, depending on the headlamp system installed at the factory. Halogen-equipped vehicles use the H11, while HID-equipped vehicles use the D2S.
The H11 is a single-filament halogen bulb rated at 55 watts with a PGJ19-2 base. It is not interchangeable with the H9 despite both sharing a similar physical housing family, as the locking tabs are positioned differently to prevent cross-installation.
The D2S is a high-intensity discharge bulb that operates through an arc between two electrodes rather than a heated filament. It requires a compatible ballast already present in HID-equipped QX50 vehicles and cannot be used as a drop-in replacement in halogen housings.
Because the low beam fitment depends on the headlamp type rather than the model year, two QX50 vehicles from the same year may require different bulbs. Confirming the headlamp system on the specific vehicle is necessary before selecting a low beam replacement.
The H9 and H11 bulbs both belong to the H-series halogen family but serve separate functions in the QX50. The H9 handles high beam output, while the H11 is designated solely for low beam use in halogen-equipped models.
The D2S designation indicates a projector-style HID bulb with a shroud around the arc tube. This shroud is a key distinction from the D2R variant, and substituting one for the other would result in improper light distribution from the headlamp housing.