Abstract: Light directing films have a surface comprising a plurality of microstructures with peaks extending along a length of the surface. Each microstructure includes a plurality of elevated portions and a plurality of non-elevated portions. A void diameter, D?c#191, of the largest circle that can be overlaid on the surface of the light directing film without including at least a portion of an elevated portion is less than about 0.5 mm. The light directing film cannot be divided into a plurality of same size and shape grid cells forming a continuous two-dimensional grid, where each of at least 90% of the grid cells comprise either a single leading edge of an elevated portion, or a portion of an elevated portion where the elevated portion has a length that is greater than the average length of the elevated portions.