A method includes receiving a first signal indicating a first movement in first predefined zone at a first time. A first activation signal is communicated to cause a first light source in the first predefined zone to be activated and provide downward illumination in the first predefined zone. A second activation signal is communicated to cause a second light source that in a second predefined zone to be activated and provide downward illumination in the second predefined zone. Responsive to an absence of receiving a second signal indicating a second/return movement in the first predefined zone at or before a second time that is after the first time, an alarm signal is transmitted that is indicative of an occurrence of a potential non-normal event.