LED lamps buzz - who knows this and knows why it happens?

Hello everyone,

after I already got such great tips here regarding the ventilation system (I am still waiting for the calculation of the sizing and will bother you again then) I have another question:
Do your LED lamps all buzz as well? My husband installed most of the new lamps today and they all buzz! Both those with fixed and those with replaceable bulbs.
Most of the lamps are dimmable with a rotary dimmer (Opus 55 Jäger direct). The more you dim, the louder the buzzing. Is it the same for you? Why is that?
Oh yes, when I put a halogen bulb in the replaceable ones, it is quiet.

Best regards!!

We only have one dimmable LED, but it cost almost 350,- due to the complex electronics, however it does not buzz. Zero nada buzz.

We once installed a dimmer for the LEDs in the living room. However, it was removed again after a short time because it buzzed. The buzzing also got louder depending on the level of dimming. Now it works without a dimmer.

The LEDs without a dimmer do not make any audible humming at all.

So for me, there is no buzzing with the Eltako push dimmers and lights/bulbs designed for them. But the humming definitely depends on the quality of the bulbs or built-in LEDs.

Ours works without a dimmer. You turn it on with the light switch, it starts dark and slowly becomes brighter, when bright enough, briefly turn off to stop. When it is bright, it slowly gets darker. Stop by turning off and on. Only off is off. After a few seconds you can turn it on again, it has forgotten everything and starts over. No dimmer.

What are the dimmers designed for? For LED?