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It may be a non-dimmable lamp, and you have installed a dimmer;
Look at what is the input power range of the lamp, it is possible that the power grid fluctuation is out of range;
There is also a possibility, whether the rectifier is connected to the front of the lamp or something;
Finally, there's the issue of lights. In this case, most of the drive power supply is not done, the adaptation range is too narrow, or the components are damaged, find customer service.
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If the bulb is in poor contact, find an installer to overhaul it.
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OK. There are two ways to connect:
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LEDs are mainly about electric current.
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It is a square integrated ceiling lamp, which cannot be changed inside, but can only be changed as a whole.