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Any number of things. Most recessed light fixtures contain what is called a thermocouplin, at least that's what we call them in the field. This is supposed to cut off the light when the heat from the light exceeds the temperature rating of the fixture. They go bad. Sockets go bad Switches go bad Loose wire connections inside the fixture. Loose wire ...


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Your best option is to caulk the can's rim to the ceiling drywall and then replace the bulb with a drop-in LED replacement. These things are self-contained units that seal off the air leakage paths themselves, and you can caulk them to the housing too for extra assurance.



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