Very impressive work bigkuz68! I don't know how I missed this journal, but I'm glad I found it... I'm very interested to hear your thoughts about the distance and effective penetration of the HGL's. I just started a test grow with the same two panels and have my lights right on top of my canopy and my girls are stretching daily... After reading your entire thread, I'm very curious to know what height you have been, and currently are from the top of the colas to the glass... :cool