I have used them in two trailers. One was great. In the second, there is sometimes a vibration in the light. I replaced this bulb with another one in the package. Same results. So what is the problem with a dimmer, transformer or LED lamp? I don't know but that seems consistent and has never been seen in over 10 years of using traditional lightbulbs. In most cases this does not happen or is imperceptible when other light sources are on. So it didn't matter much.
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