How to insulate around can lights.
Insulation around recessed ceiling lights.
A number of manufactured products are available to provide clearance for insulation around the fixture but you can also build a box using scraps of rigid insulation or drywall.
This video from green homes america provides a good overview of the air leakage issue with recessed lights and shows an actual top hat installation.
If i replace those bulbs with leds will that reduce the heat enough so i can insulate around the existing lighting cans.
Insulation is treated with chemicals to make it flame resistant but it can still ignite if left next to a source of high heat such as a non ic recessed lighting canister.