Lexus LS400 Headlight Bulb Size

Additional Notes

• The 9003 bulb is a dual-filament halogen type rated at 12V with a 60W high beam filament and a 55W low beam filament, using a P43t base. Its dual-filament design allows a single bulb to serve both high and low beam functions within the same housing, which is reflected in its use across both headlight positions on the Lexus LS400 from 1993 through 1997.
• The 9004 bulb is also a dual-filament halogen type, rated at 12V with a 65W high beam filament and a 45W low beam filament, using a P29t base. The LS400 used this bulb for both high and low beam positions during the 1990-1992 model years.
• The 9005 is a single-filament halogen bulb rated at 12V and 65W, using a P20d base. Because it carries only one filament, it is dedicated exclusively to the high beam position, which is consistent with its role in the LS400 from 1995 onward.
• The 9006 is a single-filament halogen bulb rated at 12V and 55W, using a P22d base. It serves only the low beam position and is specified for LS400 models from 1998-2000 equipped with halogen capsule headlamps.
• The D2R is a high-intensity discharge (HID) xenon bulb operating at 85V and 35W, using a P32d-3 base. It conforms to the ECE standard rather than the ANSI standard used by all other bulbs in these specifications. The "R" designation indicates it is designed specifically for reflector-type housings and requires an external ignitor to initiate the arc discharge.
• For the 1998-2000 model years, the Lexus LS400 low beam position accommodates two distinct and incompatible bulb types depending on headlamp system: the 9006 halogen bulb for vehicles with halogen capsule headlamps, and the D2R HID bulb for vehicles with HID headlamps. These two systems are not interchangeable.
• The 1995-1997 model years show a transitional fitment pattern in the high beam position, where both the 9005 and 9003 bulbs are listed. The 9003 entries carry production date qualifiers, indicating that the applicable bulb type depended on the specific build date of the vehicle rather than the model year alone.
• The P43t, P29t, P20d, P22d, and P32d-3 base types present across these specifications are physically distinct and not interchangeable with one another, meaning a bulb of the correct type number is required to match the socket in the housing.