Abstract: A translucent display panel shows a floor plan of contrasting tape or marks indicating positions of display cabinets. The floor plan is divided into small areas to which numbers are assigned, and the numbers are displayed in a store directory under respective merchandise located in the number areas. An electrical control panel having contacts marked by the same numbers is connected to control illumination of lamps. Lamp mounting means below the translucent display panel facilitates placing a lamp below any desired one of the small areas of the display panel, and wiring is completed from the numbered contacts of the control panel and the respective lamps. Both the translucent display panel and the lamp mounting means are easily removable from their cabinet to facilitate changes in the floor plan and the positions of the lamps.