FastBuds FBT2208 test

I decided to defoliate this plant a bit and take off any side branches that were not getting any light. It is starting to stack up and pushing out a bunch of new pistils. There is discolouration appearing in the leaves. Some are turning light green, some are taking on purple and brown colouration. I have been finding hard to diagnose these plants and I think in the end I may have been getting some light burn in the upper canopy. This is most apparent in the FBT2203 grow. Lights are at least 14 inches away and I recently dialed them back to about 75% power. I had them maxed throughout much of Jan and Feb to keep the room Temps above 15 Celsius in my uninsulated shed. Pictures are day 75 from seed.