LSE Lighting compatible #20 UV Lamp for Pura UV20 UV20-1 UV20-2 UV20-3 22W 8GPM Base Type: 4 Pin Base T5 (4 pins on ONE END) Compatible UV Replacement Bulb by (Light Spectrum Enterprises, Inc Brand) - fits these models UV20 UV20-1 UV20-2 UV20-3 Effective Hours Rating: 12,000hrs - Ultraviolet Germicidal Light Bulb Watts: 22W Bulb Type: T5 Style Quartz Glass