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Are they low-voltage lamps? (usually have a GU5.3 base). If they are powered by old transformers intended for halogen lamps it might be worth changing the transformers to ones meant for LEDs.

Incidentally if there are dimmer switches in the circuits then those might have to be changed too.

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Yea, 5.3 base.

Any thoughts on how to check the transformers? Is it as annoying as I assume because the transformer is hiding somewhere in the ceiling?

I've otherwise tried switch changes, but as you point out with the transformer, it might be that more than one component needs a change.

And maybe it's worth changing everything back to halogen!?

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