Alternatives
Alternatives to light shelves for window daylighting include blinds and louver systems, both of which can be interior or exterior.
Blinds reduce solar gain, but do little to redirect light into the interior space.
Exterior louver systems often rely on adjustments from either complex servo motors or building occupants throughout the day to operate well. Both of these systems can be unreliable at times, reducing the overall benefit of having a daylighting system.
Read more about this topic: Architectural Light Shelf
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—Ann Oakley (b. 1944)
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—Connie J. Downey (b. 1934)