18 Watt T5 4Pin UV Bulb For Emperor Aquatics Pond SmartUVLite Smart UV Light Effective Hours Rating: 12,000hrs - Ultraviolet Germicidal Light Bulb Used in Aquarium SmartUVLite, Pond SmartUVLite,Smart UV & Smart UV Light Length: approx: 14.5" Long, Base Type: 4pins ONE END Bulb Type: T5 Style Quartz Glass