... %, 100%, 75%, 50%(optional)9) Prolong lamp life at least 10%10)Energy-saving up to 30% compared with magnetic ballast ITEM ... BALLAST1000W1PCS/CARTON47CM*19CM*9CMABOUT US:HYDRONE was established in October 2012, we mainly produce ventilation, lighting equipment, tents, reflectors ... through the integration of resources, and create own selling style.WHY CHOOSE US: In all hydroponic suppliers in china, ...