The INFINITI I35 uses 7440 bulb size for both brake and center high mount stop light applications. Replacement chart data covers 2002 to 2004 model years.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 7440 is the sole bulb type specified across all brake lighting positions on the Infiniti I35, covering both the standard brake lights and the Center High Mount Stop Light for model years 2002-2004.
The 7440 follows the ANSI standard recognized in the United States and Canada, classifying it as a regionally standardized automotive bulb.
As a single-filament bulb, the 7440 serves only one electrical function per socket, which is consistent with its dedicated brake light application rather than a combined stop/tail role.
The 7440 operates at 12 volts and 21 watts, placing it within the standard low-voltage DC range used in passenger vehicle electrical systems.
The T20 designation refers to the wedge-base form factor of the 7440, a physical housing style that seats directly into a compatible socket without a separate metal base or bayonet pins.
The 7440 shares its T20 wedge base with the 7443, a dual-filament variant. The two bulbs are not interchangeable despite their physical similarity, as the 7443 carries a second filament that the single-filament 7440 socket is not wired to support.
The uniform use of the 7440 across both the brake lights and the Center High Mount Stop Light on the I35 means a single bulb type covers all three stop-light positions on the vehicle.