Another reason why this often happens is homeowners have an old dimmer installed. When an LED light receives the pulsating electric current, it vibrates and causes the buzz, flickering or humming sound that you hear. The length of time between each burst of current is what determines how much the light will dim. They actually chop up the current sending it to the light in short bursts. Why Do LED Lights Buzz Flicker or Hum When I Dim Them?ĭimmers do not actually lower the brightness of the bulb by reducing the current to a steady flow of less electricity. The LED gives off light in one direction whereas an incandescent or fluorescent bulb will give off light in all directions. This differs from a traditional incandescent bulb which has a filament that glows when the current goes through it. The buzzing or flickering it makes is annoying, but it can be fixed easily.Īn LED (Light Emitting Diode) uses semi conductors, and the electrons within them will light up when the electrical current goes through it. Why do LED lights buzz, flicker or hum when you dim them using a dimmer switch? The first step to fixing the problem is to understand why it is happening. 13 Shares Why Do LED Lights Buzz or Flicker when I Dim Them?
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