Lighting system , in particular a shelf lighting system, for locating products , comprising: - at least two lamp units (24-31), wherein respectively one lamp unit (24-31) or one defined group of lamp units (24-31) is associated with a different spatial region, in particular a shelf area, - a control unit for controlling the lamp units (24-31), wherein a different lamp addressing is associated with each lamp unit (24-31) or defined group of lamp units (24-31), wherein the lamp addressing is respectively linked to a product association, which is uniquely associated with a product provided in the associated spatial region, and - a user interface for displaying the product association and selecting the lamp unit (24-31) or defined group of lamp units (24-31) to be controlled via the displayed product association, wherein the at least two lamp units (24-31) illuminate the associated spatial region, wherein the control unit is designed to control the lamp unit (24-31) or defined group of lamp units (24-31) 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 (24-31) or defined group of lamp units (24-31) 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 (24-31) or defined group of lamp units (24-31), 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 (24-31), wherein respectively one lamp unit (24-31) or one defined group of lamp units (24-31) is associated with a different spatial region, in particular a shelf area, - a control unit for controlling the lamp units (24-31), wherein a different lamp addressing is associated with each lamp unit (24-31) or defined group of lamp units (24-31), wherein the lamp addressing is respectively linked to a product association, which is uniquely associated with a product provided in the associated spatial region, and - a user interface for displaying the product association and selecting the lamp unit (24-31) or defined group of lamp units (24-31) to be controlled via the displayed product association, wherein the at least two lamp units (24-31) illuminate the associated spatial region, wherein the control unit is designed to control the lamp unit (24-31) or defined group of lamp units (24-31) 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 (24-31) or defined group of lamp units (24-31) 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 (24-31) or defined group of lamp units (24-31), and wherein the mobile operating unit is designed to receive the modulated light signals and to retrieve the information contained therein. <EOS>