Final answer:
The statement is likely true as spaces without windows require artificial lighting for visibility and safety when the building is occupied.
Step-by-step explanation:
The statement that the luminaires installed for the stairway to the second floor and hallways of a commercial building, which are active when the building is occupied because those spaces have no windows, is likely true. Without natural light from windows, these areas would require artificial lighting when the building is in use to ensure safety and visibility. In a broader context of lighting design, whether in architecture or theater, the absence of natural light necessitates the use of artificial lighting, which can be carefully designed to fit the functional and aesthetic needs of the space. This concept can easily be applied to a variety of architectural designs, where lack of natural light requires strategic placement and utilization of light fixtures.