1-10v - Analogue dimming is known as 1-10v dimming. This is because the ballast produces a 1-10v DC supply that can be increased or decreased by a potentiometer, which can be either rotary or slider control. This DC supply can be increased or decreased by the switch to affect the resistance and hence the amount that the lamp is dimmed. Analogue dimming requires a ‘dimming pair’ of cables to be run around to each luminaire in the circuit. TRIAC - TRIAC dimming has been used in incandescent lamps and energy-saving lamps for a long time, at present, it is also the most widely used dimming method for LED dimming. Triac dimming is a physical dimming, starting from AC phase 0, the input voltage is chopped, and there is no voltage input until the Triac driver is turned on.