Lumen is the new frontier of facial skin diagnosis, which exploits the properties of RGB light and UV light. The chromophores present in epithelial cells respond to this light by reflecting it. The light emitted is captured by digital photography and analyzed by the software. At the end of the analysis, various images of the face subjected to the treatment will be provided, marked by the different imperfections. A graph instead will detect the present blemish as a percentage. RGB light reveals imperfections such as impurities, sebum, wrinkles, discoloration and large pores; while the UV light makes it possible to identify imperfections that are not very visible in daylight.