We just moved into a 1976 house in the Northeast. the attic has roughly 6inches of insulation already, however, the insulation is right up to and surrounding the older recessed lighting units. Should this insulation be touching the recessed lighting unit (they are older recessed lighting units that light the closets on the story below - probably original to the house). What is the proper way to insulate around these and if I add additional insulation on top of the exisiting (perpendicular across the joists), how do I treat this?

Also - there is a whole house fan - what is the best way to insulate this during the winter?