The Westwood 903 and 903-2 are ultra-compact MR16 line voltage fixtures with integral 12-volt step-down transformers. Each mounts directly over any standard 4-inch wall-mounted J-box. Various lenses, louvers and color or dichroic filters can be combined - up to three at once - to create multiple lighting effects. Lumiere's exclusive Siphon Protection System (S.P.S.) prevents water from siphoning into the fixture through its own lead wires.