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, ... , short circuit protection and overload protection8, Ignition failure protection, low voltage protection9, Constant performance, prolong the lamp life-span10, Light weight ...