Were it ambient temps causing this the entire plant would show stress. Looks like it's limited to near the base. Is that correct?

Your best bet is to start a thread in the Plant Problems forum, copy-n-paste then fill-out the troubleshooting form. (the link to the form is in my signature)

Are you spraying or splashing them with anything?
Rusty Trichome Reviewed by Rusty Trichome on . Yellow and brown spotted leaves? Alright stoners and stonerettes, here's the problem. Theres these plants in a small cabinet grow box, Purple Haze x White Widow clones, and they have began to develop yellow/pale leaves and brown spots, some leaves are becoming crunchy, and dead. An opinion of one of my colleagues suggest that this may be the result of the cabinet being too hot, due to a recent heat wave. Can anyone help me diagnose and fix my delicious babies? Rating: 5