This light is so frustrating, all the manufacturer specs show PPFD at 1m, but the highest value is like ~300 micromoles per meter square seconds. That's not enough energy for flowering, so you definitely need to hang it inside of 1m, but the manufacturer provides no details about intensity within 1m. So it's like if you want to flower correctly with their light, you're on your own to figure it out...lame.
I'm just following the manufacturers recommendation for hanging height, but I guess its just on average. I'm gonna try it a little higher for the time being but since I'm in the middle of week 7 im running out of time as well.. Need to fix this nute and light issue asap. ;/