Pentair 79101800 100-Watt 12-Volt Bulb Replacement Pool and Spa Light 12-Volt 100-Watt bulb replacement Fits Pentair Amerlite pool and spa lights Also fits Pentair StarRite pool and spa light housing models 05082, 05086 Measures 11-3/4-inch length by 9-1/4-inch height by 20-1/2-inch width