Lamps using switched power supplies actually turn the LED's on and off extremely rapidly (<300Hz) which the human eye can't see, so if your LED is flickering it may be that the LED is designed with a low switching frequency, there may be a fault with the lamp circuity, there may be an intermittent supply connection to the lamp (eg: loose or poorly plugged connector) or the flicker may be "fake" - for example the light may be reflecting from a vibrating shiny surface.
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