Amount of Fluorescent Light - Knowledgebase Question

Belmont, MA
Question by eshane
April 24, 1998
We are starting tomatoes from seeds indoors. Is it harmful to keep the fluorescent lights on 24 hours per day? Do plants really need a dark period?


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Answer from NGA
April 24, 1998

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Although most experts recommend that you keep the lights on about 16 hours per day, I keep mine on for 24 hours per day when starting seedlings. So far, I haven't had any problems. I don't have a timer, and I have a feeling that if I turn them off at night, I won't remember to turn them on in the morning before I leave for work. If you were growing plants permanently under the lights--as opposed to seedlings that will get transplanted outdoors in a month or so--it might make more difference.

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