A method for concentrating light includes converting each section of a plurality of distinct collinear sections of incident illumination into a respective one of a plurality of collimated beams. The plurality of collimated beams forms a beam-array having an initial beam-array width in an incidence plane that intersects each of the plurality of distinct collinear sections. The method also includes decreasing a width of the beam-array from the initial beam-array width to a concentrated beam-array width that is less than a total width of the plurality of distinct collinear sections in the incidence plane.