What happened when the LED power was dimmed?
Dimmer and the LED driver is not compatible, there is a strong possibility is LED power is too low, can't meet the minimum load power of dimmers, LED to the dimming instability, it is possible that move light way, PWM dimming, for example, if the dimmer switch frequency and just drive to switch frequency, noise can occur, to achieve stable dimming, different dimmers have different brand, watch what you chose, different brands have different methods.
At the same time, the power should be changed, the transformer is aged, or other faults will cause a sound, which is normal.
There is a gap between the sheets of silicon steel, and in the case of alternating magnetic fields, the steel plates vibrate. Stingy.
One is the problem of the quality of the transformer, the second is the possibility of the control of the silicon controlled by the thyristor, and there will be a certain sound, as long as it is not large enough to affect the use. It may be a little bit hot, but it's ok to heat it up.
