... resonance,Output open protection,Short circuit protection,Lamp bad protectionSafety certificationUL(E351712)Shell warming≤35° ... and energy-saving. ·Long line driven,the lamp and the ballast can be installed separately,convenient for maintenance, ... lamp life. ·Light weight. ·Easy installation,no outside starter,no compensation capacitance. ·Short start current time. 600W High power electronic ballast ...