For growing anything other than flowers/fruit, I think metal halide is the best bang for your buck. Wiring your own fixtures is not that difficult, and it saves a ton of money. I typically use spiral CFLs for seedlings that I make from a porcelain light socket and a cheap extension cord, with aluminum pans as reflectors. I can build a light for 10-20% of what it would cost to buy a "grow light."
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