Honda Motorcycle NRX1800 Rune headlight bulbs use H7 size for both high and low beam functions. The replacement chart covers 2004-2005 production 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 H7 is a single-filament halogen bulb operating at 12 volts and 55 watts, fitted with a PX26d base. The single-filament design means one bulb serves one lighting function, which is why the Honda Motorcycle NRX1800 Rune uses separate H7 bulbs for the high beam and low beam circuits.
The H7 bulb follows the ECE standard, a lighting regulation framework used across Europe and internationally. It also holds approval in the United States and Japan, giving it broad regulatory acceptance across major automotive markets.
Both the high beam and low beam headlight positions on the NRX1800 Rune use the H7 specification for the 2004-2005 model years.
Because both beam positions share the same bulb type, an H7 bulb installed in the high beam housing is not interchangeable with the low beam position in terms of function, even though the physical bulb specification is identical. Each position requires its own dedicated unit.
The PX26d base is a keyed, single-pin connector design. The keying on this base ensures the bulb can only be seated in one orientation, which is relevant to correct filament alignment within the reflector housing.