In lighting, a property of
certain glazing materials that changes the direction of transmitted
light via refraction. For example, light-directing glass block employs
prisms on the two faces for directional control. Directional
transmitting is used to reflect daylight onto a room's ceiling to
increase light levels deep in the interior. In the case of skylights,
light is transmitted in such a way as to maintain a reasonably low
surface brightness.
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