Some at the bottom and some also on top. Not a lot of leaves are affected, maybye 5-7 leaves. No problem with the other plants in the grow room. Only with the lychee today which lost 2 leaves due to the hot temperatures, but nothing like the mango tree, which has leaves with black spots that turns crips brown. I run the lights for 12 hours a day. The room is 6'8'' by 8' and the top touches about 10'.
How far your lights were?
I'll post pictures tomorrow. I opened my grow room and opened my garage door about 2'', so it should cool down.