An active sunlight redirection system comprising a light re-directing area having a plurality of contiguous light redirecting modules, forming a modular array; and comprising movable prismatic discs arranged as double prismatic discs, and top and bottom supporting frames, the prismatic discs of every light re-directing module being associated with the top and bottom supporting frames; the prismatic discs of every light re-directing module having teeth on their perimeter to transmit rotational movement using intercalated gears between said prismatic discs in contiguous light re-direction modules, the active sunlight redirection system further comprising a light detecting module having one or more detecting elements for detecting one or more environmental factors; a control module associated with the light detecting module to control a movement of said pairs of prismatic discs of the light re-directing modules according to one or more environmental factors; wherein the light redirecting modules comprise a plurality of first light re-directing modules and at least one light re-directing module different from the first light re-directing modules wherein in said at least one different light re-directing module a feature is provided to define a home position for initializing the system from a known position for all discs in that in said at least one different light re-directing module said prismatic discs comprising teeth on their perimeter have one inter-teeth space filled in or have more than one contiguous inter-teeth spaces filled in, to thereby provide an angular hard stop for all said prismatic discs. a light re-directing area having a plurality of contiguous light redirecting modules, forming a modular array; and comprising movable prismatic discs arranged as double prismatic discs, and top and bottom supporting frames, the prismatic discs of every light re-directing module being associated with the top and bottom supporting frames; the prismatic discs of every light re-directing module having teeth on their perimeter to transmit rotational movement using intercalated gears between said prismatic discs in contiguous light re-direction modules, a plurality of contiguous light redirecting modules, forming a modular array; and comprising movable prismatic discs arranged as double prismatic discs, and top and bottom supporting frames, forming a modular array; and comprising movable prismatic discs arranged as double prismatic discs, and top and bottom supporting frames, movable prismatic discs arranged as double prismatic discs, and top and bottom supporting frames, arranged as double prismatic discs, and top and bottom supporting frames, the prismatic discs of every light re-directing module being associated with the top and bottom supporting frames; with the top and bottom top and bottom supporting frames; the prismatic discs of every light re-directing module having teeth on their perimeter to transmit rotational movement using intercalated gears between said prismatic discs in contiguous light re-direction modules, having teeth on their perimeter to transmit rotational movement using intercalated gears between said prismatic discs in contiguous light re-direction modules, to transmit rotational movement using intercalated gears between said prismatic discs in contiguous light re-direction modules, using intercalated gears between said prismatic discs in contiguous light re-direction modules, the active sunlight redirection system further comprising a light detecting module having one or more detecting elements for detecting one or more environmental factors; a control module associated with the light detecting module to control a movement of said pairs of prismatic discs of the light re-directing modules according to one or more environmental factors; wherein a light detecting module having one or more detecting elements having one or more detecting elements for detecting one or more environmental factors; a control module associated with the light detecting module to control a movement of said pairs of prismatic discs of the light re-directing modules according to one or more environmental factors; associated with the light detecting module to control a movement of said pairs of prismatic discs of the light re-directing modules according to one or more environmental factors; the light redirecting modules comprise a plurality of first light re-directing modules and at least one light re-directing module different from the first light re-directing modules wherein a plurality of first light re-directing modules and at least one light re-directing module different from the first light re-directing modules different from the first light re-directing modules in said at least one different light re-directing module a feature is provided to define a home position for initializing the system from a known position for all discs in that in said at least one different light re-directing module said prismatic discs comprising teeth on their perimeter have one inter-teeth space filled in or have more than one contiguous inter-teeth spaces filled in, to thereby provide an angular hard stop for all said prismatic discs. said prismatic discs comprising teeth on their perimeter have one inter-teeth space filled in or have more than one contiguous inter-teeth spaces filled in, to thereby provide an angular hard stop for all said prismatic discs. have one inter-teeth space filled in or have more than one contiguous inter-teeth spaces filled in, to thereby provide an angular hard stop for all said prismatic discs.