Played around lowering the fixture and found that the colour blending and overlap of the emitters wasn't great in the upper portions of the tank with the lights 3 inches above the water. PAR was between 550 and 600 in the upper part but stayed at 500 in the middle of the tank and was close to 400 at the bottom. I think that to get optimal blending of the light from the emitters and good overlap 6 to 7 inches above the tank is about as low as I will want to run them.
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