Broken bulb
A lightbulb that no longer works — a source of light that has burned out and not yet been replaced.
A broken bulb in a dream is the dream's image of a source of light that has burned out and not yet been replaced. The fixture is fine; the bulb has finished its run. The dream brings the broken bulb when something in your life — an enthusiasm, a clarity, a particular mentor's input — has stopped illuminating, and the room it lit is now dim. A broken bulb noticed and changed is the dream affirming that the maintenance is being done. A broken bulb in a hallway used every day, never replaced, is the dream noting that the absence of light has been accepted as the new normal, and stumbling has been chosen over the small task of replacing.