Philips/Gavita GreenPower Plus 1000 Watt EL Double-Ended lamp is one of the best 1000 watt HPS lamps on the market. Specifically designed for high frequency electronic ballasts it has a connection at each side of the lamp, removing the need for a frame wire inside the lamp. The absence of a frame wire eliminates any shadows in the beam. Instead of being vacuumed it is gas filled, which allows for a smaller arc tube, improving the optical control. The jacket of this double ended lamp is made from quartz glass. Do not handle with bare hands. Oil from your hands can damage the lamp.