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Proceedings Paper

Holographic Lighting For Energy Efficient Greenhouses
Author(s): Rudolph Bradbury; Jacques E. Ludman; H. John Caulfield; John W. White
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Paper Abstract

The growth of greenhouse produce in the northern regions of the country is not economical because large amounts of heat are required during the cold season. It has long been recognized that one solution would be to heavily insulate large areas of a greenhouse to prevent heat loss and then use optical devices on the remaining glazing to distribute the incident light throughout the greenhouse (Figure 1). The design, fabrication and installation of holographic optical elements for this purpose is reported here. The ultimate goal is not necessarily increased yields or an economic superiority over imported produce. Since locally grown produce can be marketed rapidly and since varieties can be chosen which do not sacrifice quality for durability, local produce from holographically illuminated greenhouses will be economically viable so long as there are reasonable yields even if the technique does not result in prices competitive with produce grown in warmer climates and shipped to northern markets. There are varieties of effects here on growing plants that are unique to holographic lighting. For example, different portions of the spectrum are delivered to the plants at different times of the day and diffracted light often arrives at the plant from unusual directions.

Paper Details

Date Published: 23 February 1987
PDF: 8 pages
Proc. SPIE 0692, Materials and Optics for Solar Energy Conversion and Advanced Lightning Technology, (23 February 1987); doi: 10.1117/12.936678
Show Author Affiliations
Rudolph Bradbury, Photics, Incorporated (United States)
Jacques E. Ludman, Photics, Incorporated (United States)
H. John Caulfield, Photics, Incorporated (United States)
John W. White, Pennsylvania State University (United States)

Published in SPIE Proceedings Vol. 0692:
Materials and Optics for Solar Energy Conversion and Advanced Lightning Technology
Sandor Holly; Carl M. Lampert, Editor(s)

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