I would like to know if anybody has thoughts on this idea, vs using parabolic dishes and a distributed oil heat transfer system for solar thermal applications. I can find cheap fresnel lens', and I would like to use them to concentrate the light, then columnate it so that many concentrated beams of light could hit one spot. I know it is important to get the columnating lens precisely positioned with exact curvature, but it could be small lens. I think it would be better to deal with light for moving the heat, and transform it to heat at the one end location. I heard that an extremely large fresnel lens doesnt work well, and I am having problems finding these funded experiments from the 70's online. I would like to find more resources for these results if anyone knows of where to find them. Thank you in advance.