Pentair 79102900 100-Watt 120-Volt Halogen screw base T-4 MC for AquaLite, SunLite and SunLite LTC Lights 100-Watt 120-Volt halogen quartz screw base lamp replacement Fits Pentair SpaBrite/AquaLight pool and spa lights Also fits Pentair StarRite, SunLite pool and spa lights