The Jandy WaterColors Nicheless LED lights with HydroCool™ technology use an innovative, energy-efficient design that harnesses the cooling power of water to create a cooler running, longer lasting* light. Designed to fit in a standard 1-1/2" return fitting, these lights are smaller to accommodate complex pool designs, and operate at lower wattages, while providing the same brilliant illumination as previous models. *Based on internal testing.