The Plantmax 1000 watt Dual Arc Tube bulb incorporates both a 400 watt MH and a 600 watt HPS arc-tube in a single lamp. This gives the grower the most complete light spectrum available in an H.I.D. lamp. The bulb has an initial output of 110,000 lumens. The bulb is designed to work in any standard 1000 watt HPS lighting fixture.