The Lexus LS430 brake light requires a 7443 bulb size for proper installation and function within the lighting assembly. Data for the specified component covers the range from 2001 to 2003.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Lexus LS430 brake light circuit for model years 2001-2003 uses the 7443 bulb, a dual-filament T20 wedge type rated at 12V with a 21W bright filament and a 5W dim filament.
The dual-filament design of the 7443 allows a single bulb to serve two lighting functions within the same socket, typically combining stop and tail light duties.
The center high mount stop light on the Lexus LS430 uses the 7440 bulb across all six model years covered in the specifications, from 2001-2006.
The 7440 is a single-filament T20 wedge bulb rated at 12V and 21W, meaning it operates at full brightness only and carries no secondary dim filament.
Both the 7443 and 7440 share the T20 wedge base form factor and are governed by the same ANSI standard applicable in the United States and Canada.
Despite sharing the same T20 wedge base, the 7443 and 7440 are not interchangeable. The 7443 socket is keyed to accept a dual-filament bulb, while the 7440 socket is designed for a single-filament bulb, and substituting one for the other risks incorrect function or fitment failure.
The 7440 and 7443 operate at the same 12V supply voltage, though their wattage configurations differ due to the presence or absence of a second filament.