... quiet Product Name 400W Hydroponic electronic ballast for grow light kits Our Advantages:1, Low Energy-consumption, Timing Dimmer ballast2, High ... 5, Open circuit protection, short circuit protection and overload protection6, Light weight, small size, easy establish, work quiet, 3 years ... 400W400W1.91A≥0.995≤6%186×108×591450g Production & Packing 1, Sample lead time: 5-7 working days2, Production lead ...