Yes do edibles, im just getting over a flu and it did not help me to burn. Luckly i had the best Skywalker kush ive ever seen so it only took me a little bowl to get lit.
Isn't a light a heat source? yes it is and 48 cubic ft isn't that big. I'm not sure about what the best fan is for a small tent, but i just installed a new bathroom vent fan that pushes over 100cfm and is only "1 sone loud" its super quiet