an adjustable mount lighting system includes a housing for attachment to an anchoring structure , typically a beam within a wall , which is facilitated by the use of adjustable brackets attached to the housing using bolts and attached to the anchoring structure using screws . the housing is preferably of a rectangular shape , at least the end walls of which define a planar portion to which a light - transmitting face plate may be secured using screws . the side walls of the housing have slots therethrough into which the bolts extend , and the adjustable brackets have apertures therethrough into which the bolts simultaneously extend prior to their interconnection with their corresponding nuts . the bolts are translatable within the slots to allow adjustment of the housing with respect to the adjustable brackets , and thus allow depth adjustment of the housing with respect to the anchoring structure and the exterior surface of the face plate with respect to the adjacent structures , which may include a wall or mirror .