A computer-engineered reflector is standard here, yielding a superb 95% reflectivity and maximizing lamp output. The fixture comes fully assembled with a tempered glass lens and easy lamp access sliding door. Features a convenient adjustable base for flexibility to accommodate 250 watt or 400 watt lamps. Combined with an IceCap electronic metal halide ballast, this pendant is the perfect plug and play solution for any aquarium system.