What is often a sign of a faulty bulb?

Intermittent flickering is a key indicator of a faulty bulb. This issue typically arises due to a poor connection within the bulb's socket or internal failure of the filament. When the bulb fails to maintain a stable electrical connection, it causes the light to flicker, fluctuating between on and off states. It can also be related to voltage fluctuations in the circuit.

Recognizing flickering as a potential problem helps in diagnosing electrical issues early, possibly preventing more severe electrical hazards. On the other hand, dim lighting may indicate a different issue, such as the wrong wattage bulb being used, while color changes can suggest problems with the bulb's internal components or compatibility with the fixture. Consistent brightness is actually a sign of a functioning bulb rather than a faulty one, making it less relevant to identifying bulb failure.