The Nissan NX uses 9004 bulb size for both high beam and low beam headlight applications. The replacement chart covers 1991 to 1993 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 9004 bulb is an ANSI-standardized halogen type used in the United States and Canada, operating at 12 volts with a dual-filament design rated at 65 watts on the high beam filament and 45 watts on the low beam filament.
The dual-filament construction of the 9004 means a single bulb serves both high and low beam functions, using a P29t base to seat within the headlight housing.
The Nissan NX uses the 9004 bulb size across both the high beam and low beam headlight positions for the 1991-1993 model years.
Because the high beam and low beam positions share the same 9004 specification, both sockets accept the same physical bulb, which is a direct consequence of the dual-filament design rather than two separate single-filament bulbs being used.
The P29t base is specific to the 9004 bulb family and is not interchangeable with other common halogen base types such as H4 or 9007, even though those bulbs also use a dual-filament halogen design.