... : 50,000 hours 110-220V, 35W, 50W, 70W MH/HPS Electronic Ballast, Suitable For MH & HPS Lamp70W MH ballast, HPS ballastFeatures: Suitable for ... 10% Energy saving up to 20% compared with magnetic ballast Good regulation against supply voltage variation Constant wattage output ... -in intelligent control hot-start, immediately shutdown if the ballast fails to ignite lamp in 30 minutes, excellent ground ...