I'm new here so I hope I'm doing this right! A little about myself, I was in a vehicle accident 4 years, I'm in pain 24/7 and refuse to go back on man made drugs!!! New to growing so I need advice, My closet is 6' wide x 2' deep x 7' high, should I use a 400 watt hps. or 600 watt hps. and will a 4" carbon filter/fan work for this closet with only 4 plants growing at a time? Thanks To All!