Ray tracing study for non-imaging daylight collectors Wittkopf, Stephen ; Oliver Grobe, Lars ; Geisler-Moroder, David ; Compagnon, Raphaël ; Kämpf, Jérôme ; Linhart, Friedrich ; Scartezzini, Jean-Louis Abstract Publication: Solar Energy Pub Date: June 2010 DOI: 10.1016/j.solener.2010.03.008 Bibcode: 2010SoEn...84..986W