The leading edge dimming is to use a thyristor circuit, starting from the AC phase 0, the input voltage is chopped, and the voltage input is only available when the thyristor is turned on. That is to say, the leading edge conduction is used, and the light is dimmed by means of a natural zero-off.
LED fluorescent lamp power front dimmer has the advantages of high adjustment precision, high efficiency, small size, light weight and easy remote control. It is dominant in the market, and most manufacturers' products are this type of dimmer. However, the front cut dimmer is prone to loud noise, and this dimming method is not recommended when the requirements are high.