Lexus SC400 high beam headlight bulbs use 9005 size while low beam headlight bulbs use 9006 size. The replacement chart covers 1992 to 2000 production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Lexus SC400 uses the 9005 bulb for high beam headlights and the 9006 bulb for low beam headlights across the entire 1992-2000 model range.
Both the 9005 and 9006 are ANSI-standardized bulb types recognized in the United States and Canada, meaning they conform to a defined set of electrical and physical specifications rather than being proprietary fitments.
The 9005 is a single-filament halogen bulb rated at 12V and 65W, operating on a P20d base. The higher wattage reflects its role in the high beam circuit, where greater light output is required.
The 9006 is a single-filament halogen bulb rated at 12V and 55W, operating on a P22d base. The lower wattage is consistent with low beam use, where controlled light distribution takes priority over raw output.
Although the 9005 and 9006 share a similar physical profile, their bases differ. The P20d base of the 9005 and the P22d base of the 9006 are not interchangeable, as the base type determines how the bulb locks into the headlight housing.
The single-filament design of both bulb types means each serves only one lighting function. The SC400 therefore requires separate bulbs for high and low beam operation rather than a dual-filament unit handling both.