Lexus IS500 front and rear turn signal bulbs use the 7440NA size for replacement. The chart covers 2022 to 2024 model years with bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 7440NA is a single-filament wedge bulb built to the T20 form factor, operating at 12 volts and rated at 21 watts.
The "NA" suffix in the 7440NA designation indicates natural amber glass, meaning the bulb produces an amber output without relying on a colored socket or lens to achieve the required turn signal color.
The 7440NA conforms to ANSI standards applicable in the United States and Canada, distinguishing it from regional variants that may share the same base type but differ in glass color or electrical rating.
The Lexus IS500 uses the 7440NA for both the front and rear turn signal positions across the 2022-2024 model years, meaning a single bulb type serves all four turn signal housings on the vehicle.
The standard 7440 bulb shares the same T20 wedge base and single-filament construction as the 7440NA but features clear glass rather than amber glass. Substituting a clear 7440 in place of the 7440NA may not meet turn signal color requirements depending on the lens color of the housing.
The T20 wedge base is not interchangeable with dual-filament T20 bulbs such as the 7443, which carries a second filament and a physically different pin configuration designed to prevent incorrect installation.