I've bought many 12V led lights that flickered and were unusable with the existing dimmer or 12V transformer in the fixture. Often you need to replace the transformer, dimmer or both. I was surprised at how well these dim, despite the claim of being non-dimmable. That's an upside, since these are alot brighter than the original halogens. As others report in reviews, old dimmers are often leaky in the off position and the LEDs remain on. I kept one of the halogen bulbs to prevent this.
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