I usually keep them 24" to 30" above the canopy until I run out of adjustment. My UV lights are fixed at the top of the space. The faster wave lengths have no problem bouncing around in the grow space with the Orca Grow film. The main lights with the red and blue pucks attached to them can be raised about 30" from the start of 36" above the top of the grow cubes. I am at 42 DLI now and will hold there until mid flower.
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