I have read many posts here on lighting and I still have many questions. First off, why do people NOT talk about halogen lights? Is it a spectrum thing, or a heat thing. Sodium is the best, as far as I can see, but the fixtures are extremely expensive, while the halogen is almost given away at some hardware stores. Some halogen run off of a ton of wattage, while a sodium is only about 400wats (depending). Is it a cost per watt thing? NOW, everyone seems to have overlooked the Mercury vapor lights, which place between the other two in price, yet are comparable to the sodium or even the halide. I have tried neon, yet I think that it sucks. Power use is small, but they are a pain in the butt to keep adjusting them all the time. I also tried regular lights, which contrary to popular belief, turned out to be pretty good. Many problems arose though, such as heat, cost per bulb, and the inability to produce buds. Chemicals did help in the flowering, but I knew even when I was doing it, that there were better ways. At the time, that's all I could afford, plus I wanted to see for myself just what the results would be. Now that I want to upgrade a little (I just grow it for a puff for myself) the Mercury question keeps wacking away at my brain while the halogen question wacks away at my wallet. The wallet is winning. What's the thought.??