Does anyone have a PAR reading of 1 or 2 ATI blue + at say 18"-20" deep? If so please mention the height the lights are off the water. I found 311 per tube online with no mention of distance from the light. My own PAR meter is DIY with an older apogee sensor so not convinced of my numbers. I got 2 tubes 10" off the water at 18" depth with high end mirror reflectors 70PAR. I estimated it should be over 100.