SolarMax Vegetative lamps deliver 30% more "nutritious" light radiation than standard lamps. The result - more vigorous, vegetative growth and stronger roots during the important early stages of a plant's development. SolarMax metal halide lamps are specifically designed to deliver "Blue Light" frequency in the PAR range to your plants - unlike conventional MH lamps usually sold for plant growth. The Solarmax 400W MH Veg lamp is 7200 degrees Kelvin, and 32,000 lumens.