ENERGY MEASUREMENT FOR A LIGHTING SYSTEM

An energy measurement system (140) for a lighting system (100) is disclosed. The lighting system may comprise multiple lighting units (401) arranged in multiple lighting zones (112, 114, 116; 430), multiple sensors (111, 113, 115) associated with the lighting zones, and an energy measurement device (130). The lighting system may be arranged to switch on a lighting zone depending on at least a sensor associated with the lighting zone. Power-on energy uses of the multiple lighting zones associated with the multiple sensors is obtained from sensor data from the multiple sensors (111, 113, 115), and energy use data from the energy measurement device (130), the energy use data indicating an aggregated energy use of the multiple lighting zones at different times, and a processor circuit (143).