3x3 or 3x4

From your personal experience's, which would you chose from to use a 400w HPS and why?

Thanks.

3x3 becasue that is the area that a 400 watt light covers adequately for growing ganja.
4x4 would be a 600watter, and 5x5 would be 1000 watts.

Thanks Greenmonster22, ill go with the 3x3 and what size fan would you recommand for that area size? and it will be 6ft in height.

I don't really get how you have the option. If you can, use a 3x4 room so you have extra space to move and work, but grow in a 3x3 space, it will be the most efficient for the plants. How tall is your plants and how are you planning on venting it. Get a fan that fits easily in the space and oscillates in a room that sized you don't need anything extreme, any small fan will work.

You need to pull in fresh air, to replace the depleted co2, you also need to worry about heat. I'd go with a 500cfm fan for my exhaust. Plus an oscilating fan in the room.