What is an essential feature of emergency lighting?

An essential feature of emergency lighting is that it should be bright enough to ensure visibility during an evacuation. This is crucial for safety, as during emergencies, visibility may be compromised due to power outages, smoke, or other hazardous conditions. Adequate brightness allows individuals to see their surroundings, identify exits, and navigate safely to evacuation routes.

While factors like energy efficiency and aesthetics are important, they do not take precedence over the primary function of emergency lighting. Emergency lighting is specifically designed to provide illumination when it is needed most, ensuring that occupants can evacuate safely and effectively in a crisis situation. This fundamental purpose underscores the need for sufficient brightness over other considerations.