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Dimmer switches are an excellent option for occasionally varying light intensity needs.
Almost all the dimmer switches that you will buy today are the more-efficient solid state designs. The less expensive older rheostat designs were inefficient, so avoid them. As convenient as dimmer switches are, they are not efficient for continuous dimming. If you use the dimmer lighting conditions often, it is much more efficient to install a three-way bulb than to use a dimmer switch. A three-way bulb is basically two lighting filaments inside one bulb.