All new can lites in the USA are pretty much of the variety that allows the fixture to be covered in insulation .
I have seen various chicken wire " gadgets " used on older fixtures , to keep the insulation off the fixture .
Both varieties have thermal cut-offs to turn the lite off , if it over heats .
Still older can lites have no safety features and also should not be covered in insulation .
Keep these factors in mind . Especially , if the fixture starts to turn off & on , after you use any sort of insulation around the lite .
Best solution is to avoid can lites , if you can . A lot of the light does not make it out of the can and the light that does , does not disperse around the room very well , unless the ceiling is pretty high .
Other styles of fixtures do a better job , but may not be as " pretty " ?
Use compact florescents or LED's in all your fixtures , for energy savings . The LED's are especially advantagious for high / hard to get to fixtures , due to the long life of the lamp .
God bless
Wyr
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