Hello, I have several questions about a 400w MH Lamp: I have a space that is 5' by 4' (20 sq. feet). The ceiling is about 7'. Is the 400w sufficient for a space of this size if I'm only growing 3 plants? Can the 400w be run off of regular house current? Can I also run a very small fan and a small vent van off of the same socket? How much heat am I likely to generate from this lamp (fire danger)? I know that there are many variables, but general information would be helpful. Thanks Buds, DJ