According to safety regulations, your commercial building is required to have emergency exit lights indicating both emergency exit doors and the path to emergency exits if the route is not apparent. But installing your exit lights correctly is about more than just placement. Emergency exit lights need to function properly and safely even in situations where all other lights in the building fail.
This is why most emergency exit lights are connected to a backup battery source that will last at least a few hours after power fails or is cut off in the building. Beyond power source, you should also think carefully about the materials used to build your emergency exit lights and the bulbs that illuminate the signs so that people in dangerous situations can clearly navigate their way to safety.