LUXCORE 400 Watts HPS/MH Digital Ballast is packed with features which make it the most advanced electromagnetic HID ballast on the market. FEATURES: Durable alumium case High-efficiency energy-saving Lightweight + Quiet + Low Heat Convertible between HPS and MH Equipped with an open/short circuit protection, ignition protection, overheat protection and end of lamp life protection technology Constant power output from ballast to lamp prolongs the expect lifetime of a lamp, and increases light efficiency