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Sole-Source Lighting for Controlled-Environment Agriculture
NTRS Full-Text: Click to View  [PDF Size: 505 KB]
Author and Affiliation:
Mitchell.Cary(Purdue Univ., West Lafayette, IN, United States)
Stutte, Gary W.(Vencore Services and Solutions, Inc., Kennedy Space Center, FL, United States)
Abstract: Since plants on Earth evolved under broad-spectrum solar radiation, anytime they are grown exclusively under electric lighting that does not contain all wavelengths in similar proportion to those in sunlight, plant appearance and size could be uniquely different. Nevertheless, plants have been grown for decades under fluorescent (FL) (1) + incandescent (IN) (2) lamps as a sole source of lighting (SSL), and researchers have become comfortable that, in certain proportions of FL + IN for a given species, plants can appear "normal" relative to their growth outdoors. The problem with using such traditional SSLs for commercial production typically is short lamp lifespans and not obtaining enough photosynthetically active radiation (PAR, 400-700 nm) when desired. These limitations led to supplementation of FL + IN lamp outputs with longer-lived, high-intensity discharge (HID) lamps in growth chambers (3). As researchers became comfortable that mixes of orange-biased high-pressure sodium (HPS) and blue-biased metal halide (MH) HIDs together also could give normal plant growth at higher intensities, growth chambers and phytotrons subsequently were equipped mainly with HID lamps, with their intense thermal output filtered out by ventilated light caps or thermal-controlled water barriers. For the most part, IN and HID lamps have found a home in commercial protected horticulture, usually for night-break photoperiod lighting (IN) or for seasonal supplemental lighting (mostly HPS) in greenhouses. However, lack of economically viable options for SSL have held back aspects of year-round indoor agriculture from taking off commercially.
Publication Date: May 31, 2015
Document ID:
20150009399
(Acquired Jun 03, 2015)
Subject Category: LIFE SCIENCES (GENERAL)
Report/Patent Number: KSC-E-DAA-TN23510
Document Type: Book Chapter
Publisher Information: R. Lopez and E. Runkle, Meister Media Worldwide
Contract/Grant/Task Num: NNK11EA08C
Financial Sponsor: NASA Kennedy Space Center; Cocoa Beach, FL United States
Organization Source: NASA Kennedy Space Center; Cocoa Beach, FL United States
Description: 10p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Distribution under U.S. Government purpose rights; Under NASA contract NNK11EA08C
NASA Terms: AGRICULTURE; ILLUMINATING; LUMINAIRES; LIGHT EMITTING DIODES; PHOTOSYNTHETICALLY ACTIVE RADIATION; LIGHT SOURCES; GREENHOUSES; FLUORESCENCE; PHOTOPERIOD; CROP GROWTH; COLOR
Other Descriptors: SOLE-SOURCE; LIGHTING; CONTROLLED-ENVIRONMENT AGRICULTURE
Miscellaneous Notes: Published in Lighting Up Profits, 2nd ed.
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Last Modified: June 03, 2015
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