What is the potential consequence with some incandescent lamps when using triacs in electronic dimmers?

The potential consequence of using triacs in electronic dimmers with some incandescent lamps is that they may produce a humming sound. This humming occurs because triacs operate by rapidly switching the current on and off to control the brightness of the lamp. The electrical characteristics of certain incandescent bulbs, combined with the way that triacs switch, can lead to audible vibrations in the filament, which manifest as a humming noise.

This phenomenon is particularly noticeable in lower-quality lamps or those not designed with dimming in mind. Additionally, the hum can be exacerbated by the lamp's construction or the specific circuitry of the dimmer. It's an important consideration when selecting both dimmer switches and incandescent bulbs to ensure compatibility and minimize any unwanted noise.