Light shelf

Light shelf

A horizontal device usually positioned above eye level to reflect daylight to penetrate further into a building by reflecting some of the light onto the ceiling and to shield direct sunlight from the area immediately adjacent to the window. The light shelf may project into the room, beyond the exterior wall plane, or both. Exterior light shelves may also function as sunshades. The upper surface of the shelf may be specular or nonspecular but should be highly reflective, that is, having 80 percent or greater reflectance.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
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A traditional light shelf is a fixed, horizontally mounted plane that can be placed either outside, inside or on both sides of a window to help create reflecting surfaces for more light to enter a house.
A light shelf is a daylighting system installed on windows, which introduces external natural light into the interiors of a building.
A simple horizontal surface called a light shelf can help natural light penetrate further into your building, saving you money on artificial lighting and providing occupants with the benefits of daylighting.
One popular way to make a relatively inexpensive light shelf is to use a heavy-duty, wire storage shelving unit--the big-box-store price is around $70 for a four-shelf unit--and hang shop lights from the undersides of the shelves with wire (see illustration on Page 56).
The authors in their previous work have studied the thermal performance of a combined dynamic shading system consisting of an overhang, a tiltable internal fabric light shelf and automated bottom-up roller shades.
* Eliminate the clerestory window and its light shelf, lower the hung ceiling to a flat 9 ft, reducing the building height by 1 ft 4 in.
Given the apparent need for shading, two systems were analyzed--a) automated top-down roller shades (baseline system) and b) a combined dynamic shading system consisting of an overhang, an internal tiltable fabric light shelf and automated bottom-up roller shades (advanced system).
In fact, studies of day lighting accompanied with light shelf systems came up that control day light in buildings.
One popular way to make a light shelf on the cheap k to use a heavy-duty, wire storage shelving unit (the big-box-store price is $65 for a four-shelf unit), and hang shop lights from the undersides of the shelves with wire (see illustration on Page 69).
A light shelf reflects natural light upwards, complementing the other sources of indirect lighting.
Lighten the Load The InLighten aluminum composite light shelf from Kawneer/Alcoa is an interior extension of the company's curtain wall system, serving to reflect sunlight further into the interior spaces of the building and bounce light onto the ceiling.