Which of the following is a safety feature of emergency lighting systems?

Emergency lighting systems are designed to ensure safe evacuation and maintain illumination during power failures or emergency situations. The automatic activation during these power failures is a crucial safety feature, as it ensures that lights are operational exactly when needed, guiding occupants to exits and helping to prevent accidents in low-visibility conditions.

This automatic response is vital for safety regulations and building codes, which often require a minimum level of illumination in exit paths and areas where people congregate, even during an electrical outage. By providing this consistent light source, emergency lighting can significantly enhance the safety of building occupants during emergencies.

Other options, while they may have their own benefits, do not primarily serve as safety features of emergency lighting systems. Enhanced brightness that can blind users is counterproductive in an emergency situation where visibility is critical. Debris-resistant housing is more about durability than direct safety features associated with lighting activation. Integration with building automation systems could provide additional functionalities but does not directly enhance the fundamental safety role of emergency lighting systems.