Check the listing for details. Ultraviolet UV Light Bulb 6W for Water Sterilization System Set of 3. Condition: New. Listed at 36.99 USD. < Ultraviolet UV Light Bulb 6W for Water Sterilization System Set of 3 Made by: Unit Price: $36.99 The specifications are as follows: Set of three 6W Ultraviolet Light Bulbs (UV-6W) – Kills harmful Bacteria, E Coli, Viruses Fungi, Algae and most microorganisms including cryptosporidium and giardia, and many other contaminants. No chemicals involved. Consistent performance. Sterilization effectiveness will not decrease over time. This light bulb is a replacement light bulb for UV water sterilization system. It has to be installed inside a transparent container that isolates it from water. The light bulb itself is not water proof. It can't touch water at any time. Product Features Capacity: 1 GPM Length: 8.5" UV lamp: 6W Voltage:110v UV Lamp Life: 9000 hours (about 1 year)