The most likely cause for a breaker tripping when a light is turned on is an internally short-circuited light bulb. To confirm this, turn off the circuit breaker, remove the bulb from the fixture, and inspect it for physical signs of damage such as scorching, cracking, or glass discoloration. Replace the suspect bulb with a known-good bulb of the same wattage and type, then turn the breaker back on. If the breaker no longer trips when the switch is activated, the internal short within the original bulb is confirmed as the source of the fault.
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