The Lexus SC430 brake light utilizes a 7443 bulb size for the specific lighting components located at the rear of the vehicle. Data for the specified automotive lighting requirements covers the period from 2002 through 2005.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 7443 is the sole bulb size listed across all brake light positions for the Lexus SC430 spanning the 2002-2005 model years.
The 7443 follows the ANSI standard, making it the North American designation used in the United States and Canada.
As a dual-filament bulb, the 7443 serves two brightness levels within a single unit, which is typical for stop and tail light functions where one filament handles low-intensity running light output and the other handles the higher-intensity brake signal.
The 7443 operates on a 12-volt electrical system, consistent with standard automotive voltage.
Its wattage rating of 21W/5W corresponds to the two filaments, with 21 watts assigned to the brighter stop function and 5 watts to the dimmer running light function.
The T20 designation refers to the bulb's wedge base form factor, which is a push-in style base without a separate metal cap, seated directly by the glass envelope.
The outer brake position on the 2005 SC430 carries a production cutoff notation of "To 08/2005," indicating the 7443 fitment applies to units manufactured up to that date within the model year.
The standard brake position and the outer brake position share the same 7443 bulb size across the 2002-2004 model years, indicating interchangeability between those two positions for those years.