LSE Lighting 7W G23 base Germicidal Ultraviolet UV Bulb for Tetra Pond UV Filter 7 watt Brand: LSE Lighting Base: G23 2-Pin, Life Hours: 10,000hrs, Wattage: 7W Ultraviolet Bulb for Tetra Pond UV Filters This 7W uv bulb by LSE Lighting brand is 100% compatible for use with Tetra Pond UV 7W Sterilizer.