can overheat cause yellow leaves?(pics)

Hi, i have an issue with my 19 days old plant growing in a closet. its 3 days now that the edges of the leaves are turning a bit yellow and on one leave yellow-brown. i was wondering if the heat could be the cause of it, since i dont have a fan in the closet and the heat is high.i measured the ph and its6.0-6.1. i know that i must add a fan in there i just want you to tell me if this could be the cause.If you have any other ideas please share

yeah its from your light too much heat(thus why the look crispy and burnt) so get your self a fan and spray them with water a few times a day

yeah the are 210W in there and they are producing too much heat.unfortunately i have to keep it stealthy so i cant put anything else except a small fan.If this is the cause it will be easy for me to fix it