LUXCORE 250 Watts HPS/MH 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: 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