The UVC burners in hw-UV-water-sterilizers are characterized by an above-average service life. Nevertheless, the burners must be replaced from time to time. The UV-lamp is a wearing part and should be replaced after about 10.000-12.000 operating hours at the latest, since although after this time visible light is frequently still emitted, there is only a very small part effective radiation. If your device is still one equipped with a starter, please also change this starter to protect the UV-lamp when changing the replacement lamp. Safety for your and your aquarium comes first: In order to ensure complete operating safety and reliability, the UVC burners in hw-UV-water-sterilizers are replaced as one sealed, original hw-UV-C-burner/glass jacket unit. This completely eliminates the risk of defective seals, misaligned components, or other possible safety-related problems!Replacement Lamp for UV Steriliser hw UV 350, 10 WReplacement Lamp for UV Steriliser hw UV 500, 15 WReplacement Lamp f