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Important Note: 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 Wide Application Range: Suitable for aquarium & fish pond filters, UV clarifiers, air purification and fully enclosed external canister UVC filters. For sterilisation purposes replace every 6 months. For clarification of ponds replace every 6-12 months Premium Construction: Quartz construction with tungston filaments, giving an extended lifespan of 9000 hours on average compared to a standard UVC lamp Optimal Wavelength: 253.7nm UVC wavelength for effective green water clarification, sterilisation and purification