Lexus RX500h Turn Signal Bulb Size

The Lexus RX500h turn signal requires a 7440NA bulb size for the specific lighting components located on the front and rear of the vehicle. Data for the specified bulb covers the range from 2023 to 2024.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2023-2024	7440NA

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament wedge bulb (T20), natural amber glass. 12V, 21W.	7440NA

Additional Notes

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 follows the ANSI standard recognized in the United States and Canada, placing it within a regulated performance and dimensional classification shared across many North American vehicle applications.
The Lexus RX500h uses the 7440NA for its turn signal function across the 2023-2024 model years.
The 7440 base designation is a single-filament type, which distinguishes it from the dual-filament 7443 variant. Substituting a dual-filament bulb in a single-filament application can cause incorrect circuit behavior or illumination of unintended functions.
Because the 7440NA carries its amber color within the glass itself, substituting a clear 7440 bulb would alter the output color and may not meet turn signal visibility regulations in the United States and Canada.