Abstract: A below water light assembly for mounting on a wall surface of a pool, includes a backing plate which is located adjacent said surface of the pool when the assembly is mounted on said wall, a lens sealingly mounted in relation to said backing plate and defining a water-tight chamber therewith, and an electric light source or lamp mounted within said chamber and connectable to an electric power source by an electric cable extending from said electric light source or lamp through a water-tight seal in said backing plate. An annular housing member extends around and rearwardly from, the periphery of the backing plate. The annular housing member has a plurality of openings formed around its circumference, such that when said light assembly is mounted on said pool surface, water in the pool is able to circulate through a compartment defined by said surface, the housing member and the backing plate.