Hey Roger,
I have a couple dozen of the led traffic lights that I have been playing with. I used a few red and green ones for Christmas, and I used the yellow ones (more like orange) for Halloween. The ones I have are just standard 120V, and they dim very well with the LE controllers.
One thing I found is that the green ones are a different color green than the Christmas light leds, so they didn't look very good. The reds are a perfect match though, so those are the ones that I got the most use out of.
Kyle