Abstract: An illumination device employs electroluminescent lamps which may be used alone or may cooperate with mask layers to define one or more rows of illuminated indicia which may be easily replaced to provide other types and colors of indicia. A circuit including a photocell automatically energizes the device so as to operate above or below a threshold level of visual illumination depending on the intensity of surrounding light shining on the device. The circuit can be either hardwired to a structure, connected to a standard power cord or have an integral plug for connection to a conventional outlet. One or more interconnectable housings may be provided. The locations of the interconnectable housings may be varied relative to each other to create a unique visual impact when illuminating indicia.