The answer to 'light fixture buzzing noise' is that a buzzing or humming sound coming from a light fixture is often caused by an issue with the electrical components or wiring. This can be due to a problem with the ballast, transformer, or other electrical parts inside the fixture.
Some common causes include a failing ballast, loose connections, or a problem with the electrical supply to the fixture. The buzzing sound may also be caused by interference from nearby electronics or power lines. In some cases, the buzzing can be a sign of a more serious electrical issue that requires professional repair.