This UCL underwater lighting niche is for concrete/gunite pools. When paired with a Hayward Universal ColorLogic® or CrystaLogic™ LED light fixture, you have the best quality and value in a lighting system available anywhere. This unique shallow niche does not require a secondary dig and dedicated rebar light cage allowing you to save 1/3 yd. of gunite during the building process. In addition, the non-metallic design does not require bonding or grounding and uses PVC over expensive metal conduit. All of these features enable the UCL underwater lighting niches to offer faster installation time and huge bottom line savings in material and labor.