LUXCORE? 600 Watts HPS Ballast is the up-to-date technology in indoor gardening which can offer the highest performance and most energy efficient. It runs quieter and cooler than any other ballasts. FEATURES: ? Operate on HPS lamps ? Durable alumium case ? High-efficiency energy-saving ? Lightweight + Quiet + Low Heat ? 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