This particular brand of 375 watts did not work in the bathroom ceiling heater lamp. I bought another brand with the same 375 watts and it turned on and put out a good heat. Put both in the same nest to test them. Can't explain why "Sunlite" doesn't work. I confused the above brands. The Sunlite bulb worked great in an incandescent bulb. Another brand I bought, namely JK Heat Plus, didn't work. Excuse my mistake.
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