4x4 Sunhut perpetual grow

I am using a 4x4 Sunhut grow tent with a 600 watt HPS digital ballast with a 6 inch air cool hood reflector attached to a 424 cfm fan. I am using clones which will have been vegged for about a month. The way this is going to work is that I will be staggering the plants 2 weeks apart from each other. So when week 8 occurs and it is time to chop I will be adding 4 new plants. Therefore I will be able to harvest four plants every two weeks. I might have to tweak this as I am not sure that 600 watts is really enough to cover 16 square feet. I will be using side lighting of two 55 watt cfls untill I can afford a second 600 watt. I also have a regular fan blowing in the room. I do not think that I can fit sixteen plants in without room problems but as this is my first god at using this tent I will just have to wait and see. I am using promix soil and five gallon buckets with advanced nutrients iguana juice bloom and bud candy and molasses during flowering and iguana juice vegge during vegging and hygrozyme during both. I feed then water with just plain water twice. So feed, water, water, feed and the last two weeks just plain water. I am not new to growing and have had so far four successful grows. What I am new to is this grow tent as before I was growing in a small 1.5x1.5 closet which has worked well but I just felt now that I have some experience it is time to step it up plus waiting two months for four plants is ridiculously inefficient. Also will be doing one bubble buckets with a dripper as to see if hydroponics is something that I want to get into as I really am sick of having dirt under my nails and everywhere else (if youre a dirt grower you know what I am talking about) Possitive comments and suggestion are appreciated.