I don't know if I was just unlucky or what, but I wanted to test these bulbs out before my chicks hatched, so I screwed them in and let them sit. They warmed up very quickly and were very hot after a few minutes but a few hours later when I came back to check they were both cold and not warming up even after I switched the lamp off and on again. I tested the bulb with a regular bulb before buying it so I know it works.
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