A dimmer will not work on the secondary side and is really not designed for the primary side (120 VAC in) though it may work. A rheostat would be very expensive that could handle the wattage.
You could take 2, 6 amp diodes and make 2 circuits equivalent to about 9 volts each. Each circuit would be pulsed DC and could run lights at an acceptable level. This would use very little wattage cutting the voltage about in half. You could also make a full voltage dropper out of diodes but for large loads they would waste some wattage. Dropping voltage with diodes is explained here
http://www.jcstudiosinc.com/Bl...d=413&categoryId=426
Dale H
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