Description: Dimmers are replacements for light switches that allow the adjustment of the amount of light emitted by a lamp. Dimmers are controlled by touch sensors, +/- buttons, or simply potentiometers. Regular dimmers employ the duty factor method to reduce the mean voltage that arrives at the lamp (incandescent and some LED lamps). Fluorescent and other types of lamps require specialized dimmers that control other electrical parameters than voltage, such as frequency.