The Gavita PRO 1000w HPS DE lamp is the most powerful and highly rated bulb available from Gavita and without a doubt one of the most effective HPS lamps on the entire market. Double ended bulb designed to burn much brighter than standard HPS lamps, at the same wattage level. Does not contain a wire frame inside the lamp, as it has been specifically designed for high frequency electronic ballasts. Quartz glass outer bulb for maximum optical efficiency. Massive light output it perfect for maximizing growth during the flowering stage.