How do you guys deal with the fact that new light fixtures say that are only compatible with 90 deg. supply conductors. Older homes have 60 deg wire, according to the tag on the fixtures. What about temp rating of K&T or that old cloth style romex. It seems to me 99% of people ignore this and hang the new fixture on a remodel. I have used heat shrink tubing over the old insultion before but I dont know if this is OK. So the question is what do you do, and what is the anwser? I am totaly convinced if I tell people I got put a J box in the cieling it wont go over to well.