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I've just got a small space and am thinking about putting 11,000-13,000 lumens/sq ft on my plants. I know the sun is 10,000, and I didn't know if going too much higher would for some reason oversaturate the plant with light. I think 11,000/sq ft. will be more than enough and cheaper for me...

How many lumens per square foot is absolutely too much for a plant? I know it may very with seedlings and clones and what not, I am wondering for strong plants, around 1 foot tall, what is the absolute highest lumens you can put on them, or is the only limit the heat you produce with the lights?