Directional Transmitting

Published February 2000

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.