LSE Lighting Replacement UV Ultraviolet Bulb for Danner Sterilizer 12971 10W Brand: LSE Lighting The uv lamps must be replaced every 9,000hrs Wattage: 10W - Base: 4pin - Length: 8.35" Long This UV bulb by LSE Lighting brand is 100% compatible UV replacement for use with Danner Pondmaster 10W Clarifier/Sterilizer. All lamps listed are compatible LSE Lighting brand UV products. We do not sell Danner brand lamps. All Danner brand names, trademarks and logos are property of Danner.