Wow, again and again, so much beauty in these contest! Here's my Early Miss from Crop King Seeds. Grown indoor, in soil... So easy to grow! I don't need to go to the Superbowl this year, Dick Butkus is bringing some to me!!!
I had a similar problem than your, a few years ago... My 300w LED(very very similar than yours) was too close to my plants, I tought 2 ft. was ok and I was not sensing much heat, but it either produced too much heat or something in their light spectrum make the plants drain their iron(because it...