Industrial Lighting Solutions 11 Watt UV Bulb for Hagen Laguna PT-1500, PT-1502, PT-1520 Pressure Flo Filter 11W Effective Hours Rating: 10,000hrs - Ultraviolet Germicidal Light Bulb Used on with Laguna Pressure Filter PT-1500 and PT-1502. Length: approx: 8.35 Bulb Type: T5 Style Quartz Glass, Base Type: 4 pins on One End