Re: Grow light time-of-use question.
It depends on the brightness of your grow light, if they are on the "just barely" end, you will want to use them during the day to add to the weak sunlight. This will also allow the natural cycle to stay in balance.
If you get some really strong lamps, like growing under your house types, you can use them to extend your day artificially, but they will still need some hours of darkness.
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