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There is a divergence of opinion on this. Some say 24/0 is best, basically the more llight the better. Others say 18/6 is best, basically that 1) plants need rest and/or 2) they don't benefit from the extra light while it runs up your power bill. Even some proponents of 18/6 say 24/0 in the first couple of weeks gets the seedlings off to a good start.
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toastybiz
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