COOL TUBE DIGITAL KIT Air cooled tube,UL approved ballast, timer Heavyduty hanger,high output MH/HPS bulbs included COOL TUBE DIGITAL KIT*Air ... cool tube, well-ventilate*UL, approved digital ballast, work on both HPS and MH ... protected -well carton*Available in 400W,600W,1000W COOL TUBE DIGITAL KIT