Abstract: A light assembly for installation in an aquatic facility such as a swimming pool, fountain or the like. The light assembly has a watertight lamp housing mounted within a generally cup-like mounting box to be installed within a wall recess or opening in the aquatic facility. Both the mounting box and the lamp housing have body shells which are tapered for stacking during manufacture, storage, and installation. The mounting box has a coupling which is adapted for connection to an electrical conduit containing an electrical cable that conducts electrical power to the lamp housing and which is adjustable to accommodate a range of orientations of the conduit relative to the box. The body of the lamp housing has a unique one piece shell construction including an integrally formed main body portion and face ring which greatly simplifies and reduces the manufacturing cost of the housing.