The INFINITI QX70 front turn signal uses a 7440NA bulb size while the rear turn signal requires a 7440 bulb size. Replacement specifications in the chart cover 2014 through 2017 model years.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The INFINITI QX70 uses the 7440 and 7440NA bulb types across all turn signal positions for the 2014-2017 model years.
Both the 7440 and 7440NA are single-filament wedge bulbs built to the T20 form factor, operating at 12 volts and rated at 21 watts.
Both bulb types conform to the ANSI standard applicable in the United States and Canada.
The front turn signal on the INFINITI QX70 calls for the 7440NA across the 2014-2017 model years, while the rear turn signal calls for the standard 7440 across the same span.
The 7440NA is distinguished from the 7440 by its natural amber glass envelope, which filters the light output to produce an amber color without relying solely on an amber lens or housing.
The 7440 produces white light from a clear glass envelope, with any amber color in the turn signal output dependent on the vehicle's lens or reflector housing rather than the bulb itself.
Because the 7440NA and 7440 share the same T20 wedge base, voltage rating, and wattage, they are physically interchangeable, but substituting one for the other may alter the final color output of the turn signal depending on the lens assembly involved.
The single-filament construction of both bulb types means each serves a dedicated switching function, with no secondary filament for a combined stop or running light role.