JBL Replacement Lamp UV-C 36 WUV C water clarifier replacement bulb. Key Features: Crystal clear and healthy water: UV C water clarifier for the quick and efficient elimination of greenish and whitish cloudiness in aquariums. No change of water values, no effect on cleansing bacteria and water parameters. Germ killing UVC radiation of 255nm, reduces risk of infection. Note: UV C lamps should never be touched with bare fingers because this reduces their service life.