Hello Boss,The lighting I would use two 400watters.The 600 you can only get a convertion bulb.The 400 have HPS & MH bulbs and are cheaper.Your babes look great,go ahead and put the rings in place and let then go.Start them on your nutr at 1/4 of the bottle useage say to and then bump them up a little as they need it.and they will take off.What kind of PH meter do you have?Theres one or two small screws that you turn to adjust it.You have to use the PH buffer solution to calibration 4.01 &7.01 solution.Using two 400 watt lights you can run one with MH and the other HPS.Hope this helps.PEACE