Heat Lamp goes out after approx 12-15 minutes, obviously getting hot.
could be lamp have a thermal coupling?
Seems I should be able to add a 250 watt on any circuit without damage.
Why is the light going out?
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Can lights have thermal protectors, usually 125 to 135°F https://amzn.to/2SgaGNZ , they sometimes fail, but more often the problem is insulation in contact with a non-IC rated fixture.