The lights you have in your grow can put out twice the intensity of the sun because they are within a couple of feet or so.
People get light burn all the time. But this kind that runs up the edge like this is when lights are too high and the plant has enough water to keep itself from cooking. But the leaf edges are thin and more easily burned. So you get light edges and green centers.
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Light bleaching is similar to bleached hair from spending ample time under the sun. Read for more information on how to prevent and solve light bleaching.
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