Pentair 79102100 500-Watt 120-Volt Bulb Replacement Pool and Spa Light 120-Volt 500-Watt bulb replacement Fits Pentair Amerlite, SunBrite II/SunGlow II and SunGlow LTC pool/spa lights Also fits Pentair StarRite pool and spa light housing models 05082, 05086 Measures 15-1/2-inch length by 26-1/2-inch height by 20-1/2-inch width