GLASCO GUS-7, 1608 ,8060 , 250 16 Watt Water Treatment Germicidal UV Light Bulb Effective Hours Rating: 10,000hrs - Ultraviolet Germicidal Light Bulb Bulb Type: T5 Style Quartz Glass Length: approx: 14.06" Base Type: 4pins ONE END Highest Quality Compatible Bulb at one Third of the Cost