PlanetLight 1000 Watt Dual Arc MH & HPS Grow Light Bulb (Hydroponics Indoor Garden Metal Halide & High Pressure Sodium Lamp) 1000 Watt Dual Arc HPS/MH Grow Light Bulb 110,000 Initial Lumens; 3,000 Color Temp.; 65 CRI; ET 25 Glass Size 1 Year Warranty Included Recommended Use: With 1000 Watt HPS Systems/ANSI S52 Ballasts, 4'-6' Above Plants, Covering a 8'x8' Grow Area, During Vegetative & Flower Cycle