When I checked on my plants today a couple of the leaves on one of them had weird burns on them. It looks as though something very hot was lain across the leaf to cause a burned area in a stripe, and the part of the leaf past the burned area is shriveling. I am onloy using flouro lights which arent hot enough to burn the plant like this, and the plants arent close enough to touch the lights anyway. What could cause a burn like this? Thank you in advance for any help.