LED's do work, but you do have to get the power up. It seems most people are trying to get more than they are paying for. The wide spectrum LED panels, with some power behind them will work fine, the rule of thumb I've found is, you have to get about 1/4 to 1/3 of the same power you would get from other types of lighting. I've also found the power LED's penitrate the leaves very well, I'm not so sure about the setups with LED's that don't need heat sinking. So if you want to replace a 600 watt HPS, one third of that is 200 watts. But now you will have to look at what a panel like that cost over time.
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