The 9004 is a dual-filament halogen bulb, meaning a single bulb contains two separate filaments to produce both high and low beam output from one unit.
The Acura SLX uses the 9004 bulb for both the high beam and low beam headlight positions across all listed model years, 1996-1999.
Because both beam functions are handled by the same 9004 bulb, the vehicle does not use separate bulbs for each beam function.
The 9004 operates on a 12-volt electrical system and draws 65 watts on the high beam filament and 45 watts on the low beam filament.
The 9004 uses a P29t base, which is a specific connector type not shared with other common automotive halogen standards such as the 9007, making direct substitution with physically similar bulbs inadvisable without confirming base compatibility.
The 9004 is an ANSI-standardized bulb recognized in both the United States and Canada, meaning it conforms to a defined specification for electrical and physical characteristics.