I have a lighting fixture that uses CF13DT bulbs. How can I replace just the socket to use Edison screw in bulbs or the bi-pin GU24 bulbs?
Electrical – Change Bulb Socket in Light Fixture
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The noise is coming from the ballast (the part which converts 120 or 240 (or whatever the local standard is) VAC to the voltage and current required for the fluorescent bulb. Given that the fixture no longer works with a new bulb, that has failed, but some portion of it is still trying to work and the high-speed electrical switching common in newer-style ballasts is making the noise.
Best bet would be to replace that ballast (they do not live forever) so the light is useful again. Or, as suggested by @John, you could remove the power to the ballast (and remove the entire fixture, if you don't plan to fix it - a cover plate would go on the ceiling electrical junction box.) A third option would be to have the light retrofitted to an LED type fixture (which uses a different "ballast" or power supply) or replace the entire fixture.
I've never seen a "plug" that completely covers the socket, but you can get a two-prong adapter like this that will fill in the Edison socket and only leave the two prongs opened.
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Best Answer
That fluorescent socket is driven by a ballast, so we’re talking more than just a socket replacement.
Regardless, as Ed Beal says, do not put an Edison socket there, or some fool will put an incandescent in it and start a fire. The fixture is not insulated for that much heat. Use a proprietary LED only socket like Gu10.
Also, building codes probably required non-Edison fixtures at construction time. You’d need to roll it back on resale.