Depending on efficacy of light, you only need ~23watts/sq ft for 18-hour light operation per day. Add up umol/s PAR production of each light and divide by 57.. that'll tell you how many sq ft you can cover with those two 600w lights.
nutes are nutes.. there's no rarely much of a difference when it comes to soilless growing. I'd suggest to save money and buy in bulk dry nutes - like jacks 321 or similar. AGain, brand is mostly irrelevant if they are a professional Ag company, like JR Peters (makers of "jacks" nutrients)
Mimic the ratio and overall concentration of what they instruct and it'll turn out well your first grow, almost gauranteed. Cropsalt, megacrop, kosher-something, southern ag, masterblend all have a similar 3-part 'hydro' fertilizer setup. It's not a coincidence. It's all based upon same knolwedge base as opposed to esoteric anecdotal nonsense that can't resolve such a complicated context with any consistency. More often products that promise magical things are just preying on rubes.
Religiously get 10% runoff on every irrigation and fertilize every irrigation... adjust formula to what you see and within a grow or 2 you'll barely even think about what to do in regard to fertilization... it should be one of the easiest things you do. People that battle constant symptoms and issues are shooting themselves in the foot. That doesn't mean things should be perfect all the time, but it should be small, manageable hiccups that are rare in occurence. You need to adjust any basic instructions to your local variables no matter which brand you go with. Some will put you in a much better starting position with a shorter learning curve than others.
e.g. i have 1 plant out of 8 that's not entirely happy with my formula (all irrigated from one reservoir). It's still one of the fastest growing plants of the bunch, despite that fact. If i were growing 1 or 2 plants i'd probably take it more seriously, but i know it'll turn out fine and hang in till the end. This formula is never far off.
esoteric formulas is what creates the perception that this plant is a "picky eater." Rarely so.. and tbh, if they breed an oddball plant on purpuse, that's retarded, lol. it's an important trait to pay attention to... a plant with orthodox needs.