Why does led light bulbs makes a sound when switched off?

CA Caesarwang asked on 30 May 2020, 03:45
1 answers / 390 views / 3 votes
RI

There are little things inside the light bulb, that are tiny coils of wire, wraped around a bobbin of highly magnetic material.

When the field collapses for the last time, the bobbin makes a tiny vibration. Some times the varnish on the wires is not holding the bobbin in place, and you hear the whistle/whine as the power dissipates into the LEDs.

If you get a similar bulb and exchange it , it will not make that sound.

The proof is in the test , change the light bulb. Is the sound gone? yes. was defective light bulb. Sound not gone, then is something else.

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