| I somehow missed this thread, but I do have an answer to why you can't measure footcandles for LED lights. Your LED grow lights will only focus on the red and blue wavelengths of light since this is what a plant actually utilizes. Most of the rest of the spectrum is not used by plants. Traditional light meters cannot measure LED because they are calibrated to measure the entire spectrum of light. You will get wild variations of measurements between the high intensity of the blue or the less intense red LED's.
I like my LED panels for my bright light orchids. They all seem to be doing well with them.
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Jay
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