Safe to put insulation around recessed light cans after convert to LED?
In order to cover your recessed light cans with insulation you need to have IC-rated (Insulation Contact) cans installed regardless of the type of light installed in the can.  Since you mentioned your cans have holes in them, they are most definitely not IC-rated.  You'd have to buy some remodel IC-rated cans and replaced what you have with those before covering with insulation.