The 9007 bulb is the sole bulb type listed across all headlight positions in the Volvo VN specifications, covering both high beam and low beam functions for the 1998-1999 and 2004 model years.
The 9007 is a dual-filament halogen bulb, meaning a single bulb contains two separate filaments: one rated at 65W for high beam output and one rated at 55W for low beam output.
Because the 9007 serves both the high beam and low beam positions in the Volvo VN, the same physical bulb handles both lighting functions rather than requiring separate single-filament bulbs for each role.
The 9007 operates on a 12-volt electrical system and uses a PX29t base, which is a specific connector type that determines physical fitment into the headlight housing.
The 9007 is an ANSI-standardized bulb recognized in the United States and Canada, meaning it conforms to a defined set of electrical and physical standards rather than being a proprietary specification.
The PX29t base is not interchangeable with other common halogen base types such as H4 or H13, even though those bulbs are also dual-filament designs with similar wattage ratings.