dennych1, not everyone is aware that LEDs are not inherently dimmable. There are some electricians and architects that don't know either. Our daughter was showing the DW and me their newly remodeled master bathroom suite, when she tried to dim the lights in the closet and the bedroom they all flickered on lest than full power.
The led light fixture I incorporated in our cabinets are now flickering and it is due to the three way touch pad switch I installed after the original burned out is not of very good quality. Bought a direct replacement for the original switch and no flicker.
Yes they are all 12vdc with regulated power supplies.