Lighting system, in particular a shelf lighting system, for locating products (40, 41, 42), comprising: - at least two lamp units, wherein respectively one lamp unit or one defined group of lamp units is associated with a different spatial region, in particular a shelf area, - a control unit for controlling the lamp units, wherein a different lamp addressing is associated with each lamp unit or defined group of lamp units, wherein the lamp addressing is respectively linked to a product association, which is uniquely associated with a product (40, 41, 42) provided in the associated spatial region, and - a user interface for displaying the product association and selecting the lamp unit or defined group of lamp units to be controlled via the displayed product association, wherein the at least two lamp units illuminate the associated spatial region, wherein the control unit is designed to control the lamp unit or defined group of lamp units associated according to the product association and lamp addressing in order to visually highlight the product on the shelf when a product is selected by means of the user interface, wherein the user interface comprises a mobile operating unit, - wherein the mobile operating unit is designed for displaying the product association, and selecting the lamp unit or defined group of lamp units to be controlled, via the displayed product association, wherein the control unit is designed to emit information via modulated light signals of the at least one lamp unit or defined group of lamp units, and wherein the mobile operating unit is designed to receive the modulated light signals and to retrieve the information contained therein. - at least two lamp units, wherein respectively one lamp unit or one defined group of lamp units is associated with a different spatial region, in particular a shelf area, - a control unit for controlling the lamp units, wherein a different lamp addressing is associated with each lamp unit or defined group of lamp units, wherein the lamp addressing is respectively linked to a product association, which is uniquely associated with a product (40, 41, 42) provided in the associated spatial region, and - a user interface for displaying the product association and selecting the lamp unit or defined group of lamp units to be controlled via the displayed product association, wherein the at least two lamp units illuminate the associated spatial region, wherein the control unit is designed to control the lamp unit or defined group of lamp units associated according to the product association and lamp addressing in order to visually highlight the product on the shelf when a product is selected by means of the user interface, wherein the user interface comprises a mobile operating unit, - wherein the mobile operating unit is designed for displaying the product association, and selecting the lamp unit or defined group of lamp units to be controlled, via the displayed product association, wherein the control unit is designed to emit information via modulated light signals of the at least one lamp unit or defined group of lamp units, and wherein the mobile operating unit is designed to receive the modulated light signals and to retrieve the information contained therein.