... 3.PF>0.99 4.3 years warranty Product Name: A energy saving electronic ballast 150W hpsAdvantages: 1.Smart and lighter ... 3.Soft start, constant wattage output Ballast noise rated class A 4.CE, FCC, UL, CUL, ROHS are approved5.Prolong lamp ... power variation at 15% input voltage variationFull ProtectionProtection for open loop, short loop, over tempreture and out put power limit.Dimming FunctionKnob ...