I am pretty new to growing myself, about a year with 4 going on 5 harvests. I am very green to this so take any advice I give with caution. This forum and its experience bank are very helpful. Nice tent, nice preperation. "I" discovered a way to get some of that high spectrum light at a small small sacrifice. The tubes work well for vegging, keep them close and plentiful..and "blu" As for that 600 watter..those plants are gonna be poppin out of there..which is good..
.. I found some..I think 3500 Lumen CFL's.. well they are actually pretty big, but fit in a standard socket, the ballast is built onto them. They are 9 dolla ea with 3-5 bux on the little fixture at one of the big box hardware stores. (lowe$) Kinda hard to find, I had to ask. I ran a few of these in my closet grow before I moved to my basement..now I use them for suppplemental lighting to my lower branches and I have had greal results. You can ALMOST touch the plants, but be careful, they still make heat. I bet the bud size at least doubled on the lower branches...and all my lowest branches..which get ground up for cooking were just completely covered with sticky popcorn.. A-LOT. My cola's have come in anywhere from a half to an oz dry, no records..but still decent and quite potent. These lights are inexpensive and efficient. I have 9 sativa dom plants that get to @60" finished right now. They are @ 3 weeks out. I use a 400HPS on a mover with about 4 of these CFL's positioned strategically. I thought I'd share this only because when your plants get tall you might have some space/light challenges. You have a Great setup though for shure. Keep an open plan, don't lock yourself in and allow yourself room for change. A small space can be quickly stuffed to the point it will greatly lower your yield, and this can lead to frustration. Hopefully you are very Indica Dom.., if you run into your light during bloom, remember these CFL's, they are about a third the price you will pay at any grow supply store and work well..they lean a bit to the red side of the spectrum which is a plus. Good luck and have fun with it.