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Economic Analysis Of Greenhouse Lighting: Light Emitting Diodes Vs. Intensity Discharge Fixtures, Jacob A. Nelson, Bruce Bugbee
Economic Analysis Of Greenhouse Lighting: Light Emitting Diodes Vs. Intensity Discharge Fixtures, Jacob A. Nelson, Bruce Bugbee
Plants, Soils, and Climate Faculty Publications
Lighting technologies for plant growth are improving rapidly, providing numerous options for supplemental lighting in greenhouses. Here we report the photosynthetic (400-700 nm) photon efficiency and photon distribution pattern of two double-ended HPS fixtures, five mogul-base HPS fixtures, ten LED fixtures, three ceramic metal halide fixtures, and two fluorescent fixtures. The two most efficient LED and the two most efficient double-ended HPS fixtures had nearly identical efficiencies at 1.66 to 1.70 micromoles per joule. These four fixtures represent a dramatic improvement over the 1.02 micromoles per joule efficiency of the mogul-base HPS fixtures that are in common use. The best …