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Ballasts are necessary in indoor gardening to regulate the light output of your grow lamps, giving your plants just the right amount to grow. Ballasts regulate the current to the bulbs, optimizing the current passed and prolonging the life of the grow lights. Hydro Empire proudly offers the most dependable brands of digital and double-ended ballasts from Galaxy, Gavita, Phantom, SolisTek and UltraGROW for use in indoor gardening, greenhouse and hydroponic applications.