Abstract: A decorative lighting trim system is disclosed which comprises an assemblage of architectural moldings having a viewable surface which is structured to simulate an architectural trim or molding. The architectural molding is configured to retain lights, and to retain and conceal interconnecting electrical wiring to electrify the lights, in a manner which permits the attachment of the architectural moldings to a building surface. Because the architectural moldings are constructed to appear like conventional trims or moldings, the lighting system is virtually inconspicuous when attached to a house, building or other architectural structure, such as a fence or garage. The architectural moldings are in modular sections having varying selected lengths which allow the user to select the appropriate number and length of modular sections to extend along a given building surface, such as an eave, gable or window.