... 6", Cut-out:D151mm 3. LED Qty.: 39pcs High Power 15W 18W 20W LED Downlight Product Name 6" 18W LED ... No UV, no flickering, very short start time, saves 60% power consumption comparing with the fluorescent light, long lifespan4. Low maintenance ... used in production lines, working desks, offices, rooms, hospital lighting, school home lighting etc., perfect replacement for conventional fluorescent tubes.