Relative Efficiency of High- and Low-pressure Sodium and Incandescent Filament Lamps Used to Supplement Natural Winter Light in Greenhouses1
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Contributor Notes
Received for publication March 17, 1979. Mention of a trademark, proprietary product, or vendor does not constitute a guarantee or warranty by the U.S. Department of Agriculture and does not imply its approval to the exclusion of other products or vendors that may also be suitable.
Research Horticulturist, Florist and Nursery Crops Laboratory, Horticultural Science Institute, and Agricultural Engineer, Agricultural Equipment Laboratory, Plant Physiology Institute. The authors wish to acknowledge the contributions of Kenneth G. Lehnert, Stanley P. Holliday, Robert L. Taylor, and Richard W. Thimijan, and the support of the Fred C. Gloeckner Foundation of New York City. Plants were supplied by George J. Ball, Inc., West Chicago, IL 60185; Paul Ecke Poinsettias, Encinitas, CA 92024; Fischer Greenhouses, Linwood, NJ 08221; Hans Rosacker Company, Minneapolis, MN 55418; Earl J. Small Growers, Inc., Pinellas Park, FL 33565; and Yoder Brothers, Barberton, OH 44203.
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