Lexus RX500h Turn Signal Bulb Size

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.