Lighting system comprising a plurality of primary luminaires (10_0..._N; 100_0, 100_1), each comprising a light source, a control device (20, 20') connected to at least two digital bus interfaces (21, 22) as well as at least one sensor interface for connecting an object sensor for motion or presence detection and a light sensor for detecting a low light condition and an internal operating device that can be triggered by the control device (20, 20') for setting at least two operating modes (basic operation/nominal operation/off) for supplying the light source, wherein the plurality of primary luminaires (10_0..._N; 100_0, 100_1) is controllably connected in series by control lines in the form of digital bus portions (16_0..._N) so that at least one of the primary luminaires (10_0..._N; 100_0, 100_1) is connected via respectively one of the at least two digital bus interfaces (21, 22) with a first adjacent primary luminaire from the plurality of primary luminaires (10_0..._N; 100_0, 100_1) and via respectively the other of the at least two digital bus interfaces (21, 22) with a second adjacent primary luminaire from the plurality of primary luminaires (10_0..._N; 100_0, 100_1) and wherein each of the control devices (20, 20') comprises a nominal operation timing circuit and is designed to detect the presence of an object via the at least one sensor interface, wherein the primary luminaire detecting the object presence is designed as originating primary luminaire, as well as to transmit an associated object detection message via the two digital bus interfaces (21, 22) to the control devices (20, 20') of its two adjacent primary luminaires and is also designed to control an operating mode change to nominal operation on the associated internal operating device of the originating primary luminaire for operating the light source and to initiate the nominal operation timing circuit if a low light condition is detected on the associated at least one sensor interface, characterized in that the control device of the originating primary luminaire is designed to periodically transmit an active message via its at least two digital bus interfaces (21, 22) to its two adjacent primary luminaires as long as a nominal operation timer of the nominal operation timing circuit indicates a lower duration than a predetermined nominal operation holding time (TN_hold) associated to the originating primary luminaire and that the respective control device (20, 20') of the primary luminaires (10_0..._N; 100_0, 100_1) adjacent to the originating primary luminaire is designed to transmit a message received via one of the at least two digital bus interfaces (21, 22) via the respectively other of the at least two digital bus interfaces (21, 22) to its respectively other adjacent primary luminaire from the plurality of primary luminaires (10_0..._N; 100_0, 100_1) depending on predefined conditions and wherein the primary luminaire to which the object detection message is transmitted via one of its at least two digital bus portions by one of its two adjacent primary luminaires is designed to receive this message and in response to the receipt of the object detection message to check a light sensor signal detected via its sensor interface for a low light condition and to induce an operating mode change to "nominal operation" on its internal operating device if a low light condition is met.