What is a common consequence of not replacing burned-out control lights in switchgear?

The inability to detect equipment failures is a common consequence of not replacing burned-out control lights in switchgear. Control lights serve as visual indicators for the operational status of equipment. When these lights are functioning, they provide real-time feedback to operators, indicating whether a circuit or device is operational or in a fault condition. If a control light is burned out and not replaced, operators may remain unaware of a failure or malfunction, leading to delays in response and potential further damage to the equipment. This gap in awareness can compromise the safety and reliability of the entire electrical system, as timely maintenance and intervention become difficult without clear visual cues.

In the context, the other options don't relate directly to the consequences of burned-out control lights. Increased visibility and increased power efficiency are not achieved by failing to maintain lighting indicators. Similarly, the risk of data errors isn't influenced by the functionality of control lights in switchgear, as they serve a different purpose related specifically to equipment status indication.