Simple, reliable and inexpensive application-wise system for obtaining information on the status of apparatus connected to a “lighting power line.” System of obtaining information is completely immune to disturbances since nothing additional is introduced into the grid. Information is detected in a substation or an electric lighting enclosure i.e. at the power supply source in standard classical measurement methods. During the activation of LED lighting fixtures on each power line, power-time curves or current-time curves are measured and recorded for the corresponding energy power line, and from them a start diagram is derived after activating all lighting fixtures on that particular power line, and this diagram is used for comparing the status on each individual power line, and then the derived start diagram is compared with the initial diagram of the power-time curve or current-time curve for the corresponding power line.