The answer to 'light fixture making buzzing noise' is that a buzzing light fixture is usually 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 in the fixture.
Some common causes include a failing ballast, loose connections, or a problem with the bulb. The buzzing sound may also be caused by electrical interference or a ground fault. In most cases, this issue requires the attention of a licensed electrician to diagnose and repair properly.