I have a Millennium that has dimmable LED lights in place of Halogens. They work great and throw off no heat. An LED light is a light emitting diode that is forward biased. It would br preferable to dim it by reducing the current through it since it's forward voltage curve is relatively steep (not as steep as a silicon diode though). I know for a fact that if you reduce the current through an LED you will not kill it, you will increase it's life and it will dim. You could keep the current constant and modify the time it was on. And to the eye it would look dimmer.