Abstract: A bed lighting system for a truck bed or other wheeled vehicle having a bed with rails which includes a plurality of lamps coupled via a switch to a power source. The lamps are installed on the undersides of the top rails of the truck bed. The lamps are sized such that they fit within the top rail of the side wall and do not extend substantially below a bottom lip of the top rail. In this manner, the lamps are protected from weather and from accidental damage caused by contact with objects contained within the truck bed. Further, the lamps are substantially hidden from view even when a tailgate of a truck is removed.