Lighting system comprising at least one light source , as well as - at least one battery pack comprising at least one accumulator cell , which forms at least one energy source for electric energy supply of the at least one light source , wherein the at least one battery pack comprises a communication interface for communication with an external communication unit , and wherein the at least one battery pack comprises a battery pack housing, within which the communication interface and the at least one accumulator cell are arranged, wherein the battery pack housing is equipped with detachable electric contacts connecting the at least one accumulator cell with one or several of the at least one light source ; and - a control circuit , which is coupled to the communication interface and which is configured - to receive information concerning a predetermined time schedule from the external communication unit via the communication interface ; - to change at least one electric current from the at least one energy source to the at least one light source depending on the received information in order to automatically activate or change an operating mode of the lighting system depending on the received information; and - to control the at least one light source depending on the activated or changed operating mode for lighting an environment of the at least one light source . - at least one battery pack comprising at least one accumulator cell , which forms at least one energy source for electric energy supply of the at least one light source , wherein the at least one battery pack comprises a communication interface for communication with an external communication unit , and wherein the at least one battery pack comprises a battery pack housing, within which the communication interface and the at least one accumulator cell are arranged, wherein the battery pack housing is equipped with detachable electric contacts connecting the at least one accumulator cell with one or several of the at least one light source ; and - a control circuit , which is coupled to the communication interface and which is configured - to receive information concerning a predetermined time schedule from the external communication unit via the communication interface ; - to change at least one electric current from the at least one energy source to the at least one light source depending on the received information in order to automatically activate or change an operating mode of the lighting system depending on the received information; and - to control the at least one light source depending on the activated or changed operating mode for lighting an environment of the at least one light source . - to receive information concerning a predetermined time schedule from the external communication unit via the communication interface ; - to change at least one electric current from the at least one energy source to the at least one light source depending on the received information in order to automatically activate or change an operating mode of the lighting system depending on the received information; and - to control the at least one light source depending on the activated or changed operating mode for lighting an environment of the at least one light source . <EOS>