The Lexus IS F high beam headlight uses a 9005 bulb size while the low beam headlight requires a D4S bulb size. The replacement chart covers 2008 to 2014 model 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 IS F uses the 9005 bulb for high beam headlights across all model years from 2008-2014. This bulb follows the ANSI standard, which governs lighting equipment specifications in the United States and Canada.
The 9005 is a single-filament halogen bulb operating at 12 volts and 65 watts, fitted with a P20d base. Its single-filament construction means it serves one lighting function only, which is why the IS F requires a separate bulb type for low beam operation.
Low beam headlights on the IS F use the D4S bulb across all model years from 2008-2014. Unlike the 9005, the D4S is a high-intensity discharge (HID) xenon bulb, which produces light through an electrical arc between two electrodes rather than a heated filament.
The D4S operates at 42 volts and 35 watts and is built to the ECE standard, the regulatory framework used in Europe and most international markets. Its P32d-5 base is specific to HID applications and is not interchangeable with halogen base types such as the P20d found on the 9005.
The D4S designation includes a mercury-free formulation, distinguishing it from older HID types such as the D2S, which contained mercury. This distinction is relevant to disposal regulations in many jurisdictions.
The D4S is designed exclusively for projector-type housings. Installing it in a reflector housing would produce uncontrolled light scatter, making it incompatible with headlight assemblies not engineered for HID projection optics.
The base types of the two bulbs used in the IS F, P20d for the 9005 and P32d-5 for the D4S, are physically distinct and serve different socket configurations, meaning neither bulb is a substitute for the other in any position.