... 400W Grow tent kits ballast systemsOur Advantages:1, Low Energy-consumption, Timing Dimmer ballast2, High luminescence ... efficiency3, High Power Factor, Low THD4, Wide operating voltage range5, Quakeproof, Anti-jamming6 ... Ignition failure protection, low voltage protection9, Constant performance, prolong the lamp life-span10, Light weight, small size, easy establish, ...