As in the title, I've got a lamp hanging from the ceiling, with a regular E27-screw bulb attached. When I turn the light on, there's a quiet, buzzing noise.
The lamp was installed a couple of weeks ago and I am not sure whether the noise was there from the start, as the lamp was not used often.
While the noise is there, the light keeps still, no flickering.
I've tried 2 other bulbs and the problem persists, which tells me it's either the lamp itself, or the way it was installed.
What do you think this is?
Photos of the lamp and the base: