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I have four 20W low voltage in two units above computer-operated by reostat?

Only one bulb comes on when reostat is turned-there are two units with two 20w bulbs in each-both units have on/off switch-other bulbs are good-could it be a defective dimmer switch-and how do I determine this? thank You
Richard Cregar, November 2008
Richard
Some low voltage lights are electronically operated and not suitable for dimming and will behave as you describe

Kenny F, December 2008