I have a Goldleaf that I’m growing in a 3x3x8 tent. Before I found out about this site, I too purchased a burple. Trying to make amends to the god of lights, I purchased an HLG 280, which by all accounts, should be fine for a 3x3 tent. But me being me, I was sad having bought that 270 actual watt burple, so I decided to use them both. 540 watts of LED goodness. Since I was ordering from HLG I decided to try one of their 60 watt red supplement bars, might as well stick that in the 3x3 for an even 600 watts.
Everything went well until the forth week of flowering when what I believe is a calcium deficiency started. Apparently all that LED goodness comes at the cost of increase in nutrients. I turned off the grow switch on the burple, reduced the brightness of the quantum board, and turned off the supplemental light bar. Then I started feeding it extra cal-mag and foliar spray with calcium in it.
So what happened? The deficiency shows up throughout the canopy.
Started with discoloring of leaves. Then the buds stopped growing. Seems like I’ve stopped the progression with extra calcium.
I’m going to my grow store and buying just calcium, give it a week and then turn on all 600 watts to see what happens. The question remains, how much light is too much light, and can you compensate with feedings?
As a side note, the burple is in the back left, the Hlg QB in front and supplemental bar along right side. The back and left sides appear to grow slightly better then the rest. The supplemental bar hasn’t done anything that I can tell and this is the second grow I’ve used it on.