Muddy
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Yes, they do take up more nutrients. With 95% usable light they eat it up faster. Additional cal/mag is almost a must throughout the whole grow, and most likely more P, especially in late flowering.
I would set them at about 14" and watch the top leaves for any signs of bleaching. If none, lower it a bit more. As long as you're getting good coverage over the whole grow, which you should with two lights in that size area, you can probably go to the low end of that range.
I would set them at about 14" and watch the top leaves for any signs of bleaching. If none, lower it a bit more. As long as you're getting good coverage over the whole grow, which you should with two lights in that size area, you can probably go to the low end of that range.
Hey Muddy, I had a question for you. Do the LED lights affect the uptake of nutrients in any way at all? Also, I am getting this second light this weekend, you said 12-16" for flowering. I have a 4x4 footprint to cover. Each light has a 2x3 core footprint and puts out roughly 35,500 Lumens @ 450W. What distance from the canopy can you attest works "best"?