400W Electronic ballast 1.Works reliable,prolong bulb life 2.Constant power output ... .No MOQ,work quiet Product NameHydroponics 400W Grow tent kits ballast systemsOur Advantages:1, Low Energy-consumption, Timing Dimmer ballast2, High ... - 85505477Email: surre @ intelligon.cnContact: surre Hydroponics 400W Grow tent kits ballast systems