As long as you have a fan in room circulating air around you should be able to drop those lights atleast 12-18 inches as long as you still have coverage. After you drop lights down hold hand over top of plants, if hand hurts light to low :thumbsup:

the ppm seems good to me. I have a 10 site ebb & grow system that is on it's virgin run in the basement and they are starting week 3 of flower and ppm has been mid to high 80's since switch and ph is floating in the 5.6-6.0 range. Trying to get use to this large size res, 55 gal drum holding 28 gals of water, just a touch of a change from 6 gals :wtf: