What wattage are the CFL lights, and how far away from the plant are they? Where's the UFO and at what distance? If you hold your hand near the top of the plant and you don't get too warm within a minute or so, it's not likely to be temperature. Can you do a pic of the top of the plant close-up? It looks like it might be light intensity but it's a bit hard to tell from here.
About 2 feet, maybe a bit less, but it's an autocob style so it's pretty intense. I had humidity problems as well, so lost a bit more to bud rot LOL. I haven't thrown the plant out though!
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