The Q&A Archives: Running Time for Grow Lamps

Question: When starting seeds inside under grow-lamps what would be the optimum time to run the lamps per day? Velnette Cavanaugh Adams,WI

Answer: The optimum time to run the lights indoors is 14-16 hours a day. You can run them shorter that if you to need the slow the growth of plants that you started too early. However, don't go below 10-12 hours a day.

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