Philips 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 600 watt lamp is mogul based. For use with Gavita fixtures.