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Safety Warning: Germicidal Lamps emit UV-C radiation at 253.7nm that is dangerous to the human eye and skin. These lamps should NOT be used for general illumination and only used in a sealed filter unit or cannister Versatile Application: Suitable for aquarium & fish pond filters, UV clarifiers and fully enclosed external canister UVC filters. For sterilisation purposes replace every 6 months. For clarification of ponds replace every 6-12 months Premium Quartz Construction: Manufactured using Quartz not Glass as found with standard UVC lamps for superior performance and durability Extended Lifespan: 9000 hours average rated life compared to a standard UVC lamp, providing long-lasting reliable operation Effective UV Wavelength: 253.7nm UV wavelength specifically designed to destroy bacteria, viruses, algae and other microorganisms in water Compact Dimensions: Length measures 215mm excluding pins, compatible with standard 2G11 base pond filter systems High Output Power: 18W PLL bulb delivers powerful UV-C radiation for effective water clarification and algae control in ponds Value Pack: 2-pack configuration provides a replacement bulb for continuous operation or coverage for multiple filtration units