Wonder what its efficiency is compared to a Fresnel lens: http://www.youtube.com/watch?v=DGtA8E5iw3k http://www.youtube.com/watch?v=DGtA8E5iw3k http://images.

Wonder what its efficiency is compared to a Fresnel lens: http://www.youtube.com/watch?v=DGtA8E5iw3k http://www.youtube.com/watch?v=DGtA8E5iw3k http://images.google.com/imgres?imgurl=http://www.terrypepper.com/Lights/closeups/illumination/fresnel/fresnel-orders.gif&imgrefurl=http://www.terrypepper.com/Lights/closeups/illumination/fresnel/fresnel.htm&h=435&w=281&sz=8&hl=en&start=16&tbnid=l34jDm9V39EF9M:&tbnh=126&tbnw=81&prev=/images%3Fq%3Dfresnel%2Blens%26gbv%3D2%26hl%3Den%26sa%3DG http://images.google.com/imgres?imgurl=http://www.terrypeppe...