Electronic Ballast Suitable for MH & HPS lamp Energy saving up to ... : 50,000 hours 110-220V, 35W, 50W, 70W MH/HPS Electronic Ballast, Suitable For MH & HPS Lamp70W MH ballast, HPS ballastFeatures ... up to 20% compared with magnetic ballast Good regulation against supply voltage variation Constant wattage output Ballast noise rated class A ...