Abstract: The invention is directed to an apparatus for illuminating a decorative scene disposed adjacent to a wall of an aquarium, terrarium, or other such enclosure. The invention provides an easy to use apparatus which effectively and uniformly illuminates a decorative background and is suitable for use with a wide variety of shapes and sizes of these types of enclosures. In a preferred embodiment, the invention comprises a housing defining a cavity having an inner surface, an outer surface, an upper and lower edge, and a top portion, wherein at least a portion of the inner surface is a reflective surface and is inclined relative to the wall of the enclosure. The inclined inner surface includes means for reflecting light incident on at least a part thereof.