The answer to 'why is my light fixture tripping breaker' is that there is likely an electrical issue causing a short circuit or overload. This could be due to a problem with the light fixture itself, the wiring, or the circuit breaker.
Some common causes include a faulty light bulb, a loose connection in the fixture, damaged wiring, or a circuit breaker that is not rated for the electrical load. When a light fixture trips the breaker, it's a sign that there is too much electrical current flowing through the circuit, which can be a fire hazard. It's important to address the issue promptly to ensure safety.