Does dimming LED lights save energy?

First of all, we should see what brand it is. If the power supply has PFC function, it will definitely save energy. All of our UL listed power supply has high PF>0.98.  It can play a role in energy saving, because dimming is controlled by PWM waves. Simply put, it is a square wave that is turned on and off. However, the frequency is high and the switching time ratio determines the power consumption of energy-saving lamps. Work for a while and rest for a while, so it will save power than full brightness.

In some cases, it mainly depends on the power of the LED lamp when it is working.

Stepless dimming only power of the lamp, for example, it can be 10W or 3W. It depends on the specific positioning on how much power. The power loss of the dimmer itself is very small, less than 1W LED driver.

From a physical point of view, there is no stepless dimming power supply 100w that can save power. For a certain kind of lamp, its conversion efficiency is basically certain. The concept of power saving is at the expense of brightness reduction.

A 50W led power supply ordinary Compared with a 100W lamp with dimming, LED has the same brightness and power consumption when it is dimmed to 50W.