A lighting system comprising: a plurality of lighting apparatuses (41, 42 to N, 50, 51 to M) including a first lighting apparatus and a second lighting apparatus (42, 52) connected to the first and to any subsequent lighting apparatuses (N, M) in series; and a bridge device (40, 50) coupled to the first lighting apparatus in series and configured to assign an address to the first, second and any of the serially connected lighting apparatuses, wherein each of the lighting apparatuses includes an LED module, a memory configured to store addresses, and a control circuit (451, 452 to N", 710) configured to control a connection to a subsequent lighting apparatus, characterized in that the bridge device is configured to transmit a first data packet to initialize the first, second and any of the serially connected lighting apparatuses (41, 42 to N, 50, 51 to M) in response to a request for address assignment transmitted from any of the serially connected lighting apparatuses (41, 42 to N, 50, 51 to M), in each lighting apparatus, the control circuit is configured to disconnect the connection to the next subsequent lighting apparatus for address assignment and to delete a previously assigned address in the own memory in response to the first data packet, the bridge device is configured to transmit a second data packet that includes a first address to the first, second and any of the serially connected lighting apparatuses through the serial connection, in each lighting apparatus, the control circuit is configured to determine whether an address assignment is needed based on whether a previously assigned address exists in the own memory, to store the address in the own memory if the address assignment is needed, and to transmit a confirmation to the bridge device indicating that the address assignment is completed, and to reconnect the connection to the next subsequent lighting apparatus, wherein the lighting apparatus that requires address assignment is configured to transmit a request for address assignment to the bridge device through the serial connection, and wherein the lighting apparatus that requires address assignment is at least one of the lighting apparatuses or a newly added or replaced lighting apparatus. a plurality of lighting apparatuses (41, 42 to N, 50, 51 to M) including a first lighting apparatus and a second lighting apparatus (42, 52) connected to the first and to any subsequent lighting apparatuses (N, M) in series; and a bridge device (40, 50) coupled to the first lighting apparatus in series and configured to assign an address to the first, second and any of the serially connected lighting apparatuses, wherein each of the lighting apparatuses includes an LED module, a memory configured to store addresses, and a control circuit (451, 452 to N", 710) configured to control a connection to a subsequent lighting apparatus, characterized in that the bridge device is configured to transmit a first data packet to initialize the first, second and any of the serially connected lighting apparatuses (41, 42 to N, 50, 51 to M) in response to a request for address assignment transmitted from any of the serially connected lighting apparatuses (41, 42 to N, 50, 51 to M), in each lighting apparatus, the control circuit is configured to disconnect the connection to the next subsequent lighting apparatus for address assignment and to delete a previously assigned address in the own memory in response to the first data packet, the bridge device is configured to transmit a second data packet that includes a first address to the first, second and any of the serially connected lighting apparatuses through the serial connection, in each lighting apparatus, the control circuit is configured to determine whether an address assignment is needed based on whether a previously assigned address exists in the own memory, to store the address in the own memory if the address assignment is needed, and to transmit a confirmation to the bridge device indicating that the address assignment is completed, and to reconnect the connection to the next subsequent lighting apparatus, to determine whether an address assignment is needed based on whether a previously assigned address exists in the own memory, to store the address in the own memory if the address assignment is needed, and to transmit a confirmation to the bridge device indicating that the address assignment is completed, and to reconnect the connection to the next subsequent lighting apparatus, wherein the lighting apparatus that requires address assignment is configured to transmit a request for address assignment to the bridge device through the serial connection, and wherein the lighting apparatus that requires address assignment is at least one of the lighting apparatuses or a newly added or replaced lighting apparatus.