The buzzing sound is very annoying for everyone. For tackling the buzzing sound it’s necessary to find out the reason. Overload of dimmer switches is the major reason for creating a buzzing sound. If the dimmer switch is designed for 200 watts LED bulbs but you give the pressure of 250 watts to the dimmer switch then obviously you will hear the buzzing sound. For an overload of current flow inside material may vibrate and results, you hear sounds continuously after turning the switch on. But, if you use the appropriate wattage and still hear a buzzing sound then it’s better to switch off the lights and check if the connection is okay or not. If you don’t have sufficient knowledge regarding this please call an electrician to fix the thing.