The Acura Legend high beam and low beam headlight bulbs both utilize a 9004 size. The replacement chart covers vehicle production spanning 1986 to 1988.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 9004 is a dual-filament halogen bulb, meaning a single bulb contains two separate filaments to serve both high and low beam functions from one housing position.
The Acura Legend (1986-1988) uses the 9004 bulb for both the high beam and low beam headlight positions, indicating that each headlight housing relies on a single dual-filament bulb rather than separate bulbs for each function.
The 9004 operates at 12 volts and draws 65 watts on the high beam filament and 45 watts on the low beam filament, reflecting the standard power differential between the two output levels.
The 9004 is built to the ANSI standard and is approved for use in the United States and Canada, classifying it as a regulated, road-legal bulb type in those markets.
The 9004 uses a P29t base, which is a specific bayonet-style connector. Bulbs with different base types are not physically interchangeable with this socket, regardless of wattage or voltage similarity.
The 9007 bulb is a common point of confusion with the 9004, as both are dual-filament halogen types with similar appearances, but the two have different pin configurations and reversed high/low wattage assignments, making them incompatible substitutes.