The answer to 'light fixture making buzzing noise' is that the buzzing is likely caused by a problem with the electrical components of the light fixture. This can be due to a variety of issues, such as a faulty ballast, loose connections, or a problem with the wiring.
Some common symptoms of a buzzing light fixture include a humming or buzzing sound, flickering lights, or the fixture not turning on at all. If the buzzing is accompanied by other issues like dimming or flickering lights, it's a good idea to have the fixture inspected by a professional electrician. They can diagnose the problem and recommend the best solution, whether that's repairing the existing fixture or replacing it entirely.