Yea u get 10,000 lumens consistently with the sun. This is on top the canopy and below it. As the sun has the power to penetrate through the leaf. 10,000 lumens is like a 250halide. So a 400 will give u more canopy power, but cannot penetrate like God's sun, neither will a 600. 600's are great for flower. 1000w is the only light that will penetrate through the foliage. I hope this helps. I have a lumens meter or candle power meter. I have actually posed this question before. Why I bought the meter. Waste of $35.