If the Lights instructions indicate a special dimmer than it is best to use that type of dimmer. I have installed low voltage halogens which have a magnetic transformer to reduce the voltage and they reguired a magnetic dimmer. That dimmer cost 175 dollars, ouch! I am not quite sure of the type of lights you are installing, does each have its own transformer? Are they operated off of a 12v system?

Thanks so much for trying to help. Each light does have its own transformer, and it is a 12v system.... The bulbs required are 50wattMR-16. The package says to use an "electronic low voltage transformer dimmer". Nothing about magnetic.
any ideas? -Susan

The best bet is to stick with what the instructions say. If you do not you may void warranties or cause strange electrical problems elsewhere in the circuit. The magnetic dimmer i spoke of earlier was used for the same type of lamps that you track lights use. However it only had one transformer for all the lamps. The dimmer required that a neutral wire be installed in the switchbox to the dimmer. This is not a usual type of installation. My only guess is that somehow the dimmer controlled possible harmonic or feedback problems which may develope from the electromagnetic forces that occur when changing the primary voltage of the transformer. It may be very possible to use a regular dimmer with these lights and they may function properly without any other problems. But my suggestion is to find the right dimmer and install it properly. Good luck.