Quote:
Originally Posted by drew51
OK, well i didn't get that from the video. If that's why, it should have been made clear. On my lights I'm not sure about wattage? Input is 230 Watts. Output is 20,000 lumens. I also use diamond foil around plants. In the spring/summer they will get full sun.
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Lumens are a measure of human perception of brightness. There is no relevance to plants. They are only on the label because of an outdated US architectural law regarding light bulbs. What matters for plants is spectrum (6400-6500 Kelvin) and Watts/sq.ft. of projected area. Fluorescent bulbs have an output efficiency (initially) in the high 90 percentile, so input Watts is very close to output Watts.