... work quiet Product Name 400W Hydroponic electronic ballast for grow light kits Our Advantages:1, Low Energy-consumption, Timing Dimmer ... 5, Open circuit protection, short circuit protection and overload protection6, Light weight, small size, easy establish, work quiet, 3 years ... Packing 1, Sample lead time: 5-7 working days2, Production lead time: 25 working days3, Packing: 1pc+manual/bubble bag, 6pcs/ ...