Are you using the product in Poser or DS? If DS then from reading the description you will need to alter the surfaces to either a 3dl shader or an Iray one and then alter the settings to emit light. Although the title says DS and Poser the description says the mats will need to be altered, ''Note :- The set comes in Poser format only as they all work (with the exception of Materials) well in Daz Studio.''