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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 Extended Lifespan: 9000 hours average rated life compared to a standard UVC lamp Optimal UV Wavelength: 253.7nm UV wavelength for effective germicidal action and water clarification Compact Dimensions: Length measures 310mm excluding pins for compatibility with standard pond filter systems High Performance Output: 24W PLL 2G11 UV-C bulb provides powerful ultraviolet light for efficient algae and blanket weed control in pond environments