A 400 watt MH or HPS puts out like 40,000-53,000 lumens. The bulb you have there puts out 9500. I know it's a combo of things that make lights grow plants well, but the one thing that works is 50 watts per square foot. Of any light ( besides green of course). The proper spectrum is important to maximize the amount and quality of the flower, but a bright light will grow a plant. Can you give some measurements of the area you would like to grow in, and then it will be easier to compute accurate lighting numbers.
Peace,
p