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How much of an area can a 400 watt HPS bulb cover? I'm thinking about ordering this bulb since it also has 30 watts of blue light: http://www.specialty-lights.com/9960.html

I'm planning on starting an indoor grow and hoping to do it in the easiest and most efficient way possible. I'm moving into a new house soon and will have a 15x15x8.5(h) ft room available for use. I'm looking for the highest yields and the best quality, but I also do not want my electricity bill...