The light redirecting films have a thin optically transparent substrate
having a light entrance surface and an opposite light exit surface, at
least one of the surfaces including a pattern of individual optical
elements of well defined shape having two differently curved surfaces.
The individual optical elements are quite small in size relative to the
length and width of the substrate, and redistribute light passing through
the substrate in a predetermined angular distribution. The individual
optical elements may be distributed on the surface of the substrate such
that some intersect each other, or the placement may be randomized.