If you want to wrap atube in acitate get the stage lighting stuff stuff. It's heat proof and wont melt/catch fire. I use the stuff for studio work. leave the light on for 5 minutes and you burn yourself touching then. lights don't get much hotter thatn these things and the coloured gels are fine. You'd get away with something other if you're usuing tubes but I don't know what to suggest for it. normal coloured plastic may be ok but it also could melt.
Time for one or more of the others to step in here I think.
Time for one or more of the others to step in here I think.