NOVELTY - Photovoltaic system comprises: many elongate solar cells, where each solar cell comprises crystalline silicon (c-Si); and a lens array (1) comprising many lenses (3a-3d) oriented along a common axis, where each lens is configured to concentrate incident light in substantially one dimension on the elongate solar cells (5a-5d), and lens has a concentration ratio of 3x -30x .    USE - Used as photovoltaic system.    ADVANTAGE - The photovoltaic system reduces cost per watt related to the potentially reduced amount of semiconductor.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (1) a photovoltaic system comprising: at least one lens array comprising many lenses oriented along a common axis, where the lenses are patterned from low iron float glass along a float glass line, and the lenses each has at least one convex major surface when viewed in side cross section; and tubing on a non-light incident side of at least one lens array, where the tubing is suitable to convey liquid there-through and has at least one elongate solar cell comprising c-Si disposed on it proximate to or over a liquid input location, where at least one lens array is oriented relative to the tubing so that each of the lens is arranged to concentrate light incident on it in substantially one dimension on the tubing to generate electricity via at least one elongate solar cell and to heat the liquid from an initial temperature at the liquid input location to an elevated temperature as the liquid moves through the tubing to a liquid output location;    (2) a building product comprising: many elongate solar cells comprising c-Si supported by a cover glass substrate; and a lens array comprising many lenses oriented along a common axis, where the lens array is substantially parallel to and spaced apart from the cover glass substrate and is patterned from a single low-iron glass substrate; and    (3) a solar photovoltaic module comprising: an array comprising many reflective elements oriented along a common axis, where the array is patterned from low iron float glass, and the reflective elements each has a concave major surface when viewed in side cross-section; and many elongate solar cells on a glass substrate, where each solar cell comprises c-Si, and the array is oriented relative to the substrate so that each reflective element is arranged to concentrate light incident thereon in substantially one dimension on the elongate solar cells.    DESCRIPTION OF DRAWING(S) - The figure shows an illustrative linear focusing concentrating photovoltaic system including a cylindrical lens array made from patterned glass.    Lens array (1)    Lenses (3a-3d)    Solar cells (5a-5d)