I had a horrible time with my Root Farm LED light. Last winter it burned everything. At first I thought the problem was that I was switching from another light to the LED, and also that the plants were too close, but this year I kept the light a good 8-9 inches above my micro tomatoes yet it still burned them. I put them under T8 lights and tried growing lettuce under the LED's, but that didn't do so well either
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I'm so glad that I grow my tomato and pepper starts under T5's.
Linda