What is the difference between IC and none IC? Does the IC has insulation build in to prevent the case get hot? Can I just simply wrap some silicon or heat insulation sheet around an none IC recessed light house and be able to put insulation right around? I already have insulation in the ceiling, it is hard to clear around the light house to have insulation not in contact with the light house. Also, by doing so, I might lose sound insulation through the light.