The LED lamp’s driver electronics converts AC input power to low voltage DC power and maintains a regulated current to drive the high-brightness LED load for constant light output. There are many varieties of the dimmer circuit using devices with different characteristics combined with variations in the control circuitry and filtering components. The triac, a bi-directional semiconductor power switch, is triggered by a pulse generated by a variable timing circuit and maintains conduction while its conducted current remains above a certain level termed as the holding current. These deficiencies result from the fact that the vast majority of dimmers installed in the US are based on the triac-based two-wire leading edge phase cut circuit developed in the 1960s intended for use with resistive incandescent lamps.
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