A ceiling mountable light box including: a first outer backing case having an elongated light source mounted thereon with associated light source driving electronics; a reflection subassembly, including an elongated diffuser and a series of reflection surfaces, the reflection subassembly adapted to mate with the first outer backing case, such that, the reflection surfaces surround the elongated light source when mated together. Preferably, the elongated light source can be interchangeable between fluorescent or LED and the light box can be adapted to fit in an overall project specific frame.