The Acura RDX brake light requires a 7443 bulb size for proper installation and function within the lighting assembly. Data provided covers the range from 2007 to 2015.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Acura RDX uses the 7443 bulb for brake lights across the 2007-2015 model years.
The 7443 is a dual-filament wedge bulb in the T20 form factor, rated at 12V with a 21W/5W output, where the higher wattage filament serves the brake function and the lower wattage filament serves a secondary function such as running lights.
The T20 wedge base of the 7443 is a push-in connector type, meaning it does not use a bayonet or screw base, and substitutions must match this base style to seat correctly in the socket.
The 7443 meets ANSI standards as recognized in both the United States and Canada, indicating a standardized physical and electrical specification shared across many North American vehicle applications.
The Center High Mount Stop Light on the Acura RDX uses the 921 bulb across the 2007-2015 model years.
The 921 is a single-filament wedge bulb in the T15 form factor, rated at 12V and 16W, making it a lower-wattage unit than the 7443 used in the main brake light positions.
The T15 wedge base of the 921 is physically smaller than the T20 base of the 7443, and the two bulb types are not interchangeable despite both using wedge-style bases.
Both the 7443 and 921 conform to ANSI standards for the US and Canadian markets, which governs their electrical ratings and base configurations.