As a sup­plier of exter­nal light­ing we have reflected upon our activ­i­ties in the con­text of this ques­tion. We have inten­sively con­cerned our­selves with the rela­tion­ship between man and nature. The results are fas­ci­nat­ing per­cep­tions of the cul­ture of form and design, of man-made loca­tions in har­mony with nature and the related ques­tion of what con­sti­tutes sus­tain­able light. We have iden­ti­fied the fol­low­ing influ­enc­ing fac­tors that are par­tic­u­larly impor­tant to us. Let us together per­ceive and pre­serve the beauty and unique­ness of our planet.