One quick tip if you haven't found it out yet is NEVER spray water on your plants with the lights on. The bead of water act like little magnifiers and can burn the leaves. I always try to water during lights out, especially when the plants are young. I'm sure most experienced growers know this but thought I would put it out for anyone that hasn't learned it yet. I would normally start my lights at about 24" for the first few days and then slowly lower them as the seedlings begin to grow, watch for stretching and that will tell you when to lower your lights. Good luck on you grow.
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It is dangerous to be right when the government is wrong.
- Voltaire