I'm going to remove some lenses to increase spread. I'm only at 13" above tank and feel that going 16" above would be better, but, being that it's beside my couch that height would give a direct view into the led and be distracting from its location. Anywhere else and the height would definitely be a solution. If I had the extra $ I would have gone with 2 16" to allow better spread, but, for what I've got, the one 32" is perfect. I measured at 100% both spectrums and moonlight at 12" below the light 120000lux, which translated to roughly 2k par. (I know there's no formula, but there is a roundabout way to get an educated estimate) I'm running 20% white and 20% blue to acclimate from my kessil 160s and hitting about 650 par at water surface which will slowly rise over the next couple of weeks.