Replaced halogen bulbs 12V MR16 with this brand. Of the six ordered, four flicker in the same lamps. Conducted a series of tests to troubleshoot fixture or power supply issues and concluded that the LED bulbs are somehow unstable. I tested a more expensive and better quality LED bulb from Feit Electrics and had no problems with it in all track lights and all tracks. Listen to bad reviews. For some reason, they may not work for you. I probably won't send them back. at the moment 2 out of 6 work and are cheap. But don't mess with this brand.
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