I have the lights just a couple inches above the plants. I turn the lights on ~6-7am and off ~8-9pm, so that's 13-15 hours a day. Sometimes I'll bring the flats up by our south facing patio door during the day when I'm getting ready to move them into the cold frame for a couple days, I don't know if that's necessary, I just don't want them to get sunburn when making the move to the cold frame.
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