Abstract: An exterior display lighting system for a vehicle includes generally rectangular structure, having an outer surface and an inner surface spaced there from, so as to define an enclosure which is adapted to be attached to the vehicle, either as a modified or replacement integrated part, e.g. a tailgate or door, or as a removable accessory to the vehicle. An aperture in the outer surface extends over a substantial area of the outer surface, and a light transmitting panel mounted on said structure covering the aperture. In some instances the anel may be translucent, or it can be transparent. A lighting assemblage is supported within the structure and acts to transmit light against and through substantially the entire area of said panel. There are means for supplying and/or modulating power to parts or all of the lighting assemblage. Also provided are fittings and parts to enable conversion of a factory-supplied tailgate or door into a receptacle for the exterior display lighting system.