Stairwell lighting is provided in structures where the floor elevation occurs and a set of steps or several flights of steps are present. It is an indispensable part of the lighting infrastructure designed for industrial, intuitional and commercial facilities. Fire and life safety codes require that stairwells are adequately illuminated during the time of occupancy so as to facilitate safe movement of occupants. Stairwell lights are installed to highlight the tread surfaces and the transitions between treads. They often operates on a 24/7 schedule despite very low, intermittent use. Lighting control systems are prevalently installed to automate the operation of stairwell lights. They reduce energy costs by adapting lighting to the varying occupancy and daylight levels. Some products have a backup power source and are configured to automatically provide uninterrupted emergency operation during a utility power outage.