The present embodiments provide methods and apparatuses for providing prescribed illumination. Some embodiments provide lenses that include a two-dimensional beam-forming lens-profile where the profile acts to deflect light rays from a light source into a relatively narrow output beam. A zone of higher...http://www.google.se/patents/US20050024744?utm_source=gb-gplus-sharePatent US20050024744 - Circumferentially emitting luminaires and lens-elements formed by transverse-axis profile-sweeps
