It provides brilliant, double contact quartz-halogen lighting for all vinyl liner and concrete pools and massage pools. this revolutionary, patented design uses a mounting hub and bracket instead of a niche. the light eliminates the need for pre-cast niche. costly make up panels and extra plates. It reduces installation costs and leak potential for concrete and vinyl pools. PC lens is tough enough to be hardly broken. it meets IP68 waterproof standard. yellow and blue color lens optional.