Lexus SC400 License Plate Bulb Size

Additional Notes

• The 168 bulb is the specified license plate bulb size for the Lexus SC400 across all model years listed in the specifications, spanning 1992-2000.
• The 168 bulb follows the ANSI standard recognized in both the United States and Canada, placing it within a regulated and widely adopted specification framework.
• It is a T10 miniature wedge-base bulb, meaning it uses a wedge-style base rather than a bayonet or screw fitting, which requires a compatible wedge socket for proper installation.
• The bulb operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles.
• At 4.9 watts, the 168 is a low-wattage bulb, which is typical for license plate lighting applications where illumination requirements are modest.
• The T10 designation refers to the bulb's tubular envelope size, with the number indicating a width of 10 eighths of an inch, a common sizing convention in the ANSI miniature bulb classification system.
• Because the 168 is an ANSI-standardized type, it is produced by multiple manufacturers and is broadly available as a direct-fit replacement for the SC400's license plate housing.
• The wedge base design of the 168 means the bulb is held in place by the socket's contact tension alone, with no separate locking mechanism or base pin required.