Yeah, mastergreen is right, it has alot to do with the size of your buckets and the number of plants, for example, if you have 3-4 plants per light then use bigger buckets (7g-10g) and veg somewhere between 5-6 weeks, but, if you have something like 8 plants per light then use smaller buckets (3g-5g) and veg for 3-4 weeks, also, topping or some type of training would be great to keep'em short and bushy, I've always seen better results when ppl keep an even canopy. You wanted to know how much space between each plant, that also depends on how many plants your gonna grow, just don't crowd them too much. I don't know how much experience you have but the more you grow the better your goin to get, sometimes you have to make mistakes so you can learn from them (just don't make the same mistake twice LOL) ...let us know whats goin on and good luck.