Abstract
A RECENT communication1 described the lighting arrangements in a growth-cabinet with radiation having a spectral energy distribution and intensity equivalent to sunlight at 2,000 lumens per sq. ft. By installing more powerful lamps, this intensity has been substantially raised; but field experiments indicate that it is still below the maximum to which many plants will respond. A quantitative understanding of the morphological and physiological changes at intensities approaching full sunlight is not only of theoretical interest, but also has immediate bearing on a number of pasture problems of considerable economic importance. The xenon arc lamp announced by Aldington2, and the more recently developed air-cooled designs3, appeared to have definite possibilities for meeting this requirement.
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References
Mitchell, K. J., Nature, 166, 35 (1950).
Aldington, J. N., Trans. Illum. Eng. Soc., 14, No. 2 (1949).
Cumming, H. W., Light and Lighting, 43, No. 3 (March 1950).
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CUMMING, H., MITCHELL, K. Application of the Xenon Arc-Discharge to Experiments in Crop Physiology. Nature 167, 567–568 (1951). https://doi.org/10.1038/167567b0
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DOI: https://doi.org/10.1038/167567b0
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