Backgrounds and Artificial Lighting for Standardized Grain Inspection

C. H. Kingsolver, J. N. Yeatman, R. A. Boller and J. A. Thompson

No 313304, Marketing Research Reports from United States Department of Agriculture, Agricultural Marketing Service, Transportation and Marketing Program

Abstract: Excerpts from the report: The accuracy of grain inspection depends heavily on proper lighting. Even where daylight can be used, it changes with the hour and the weather. And the volume of grain shipments and handling has increased so much that many inspection offices are in use 24 hours a day. The need, therefore, is to have artificial lights that will give adequate illumination of constant quality approaching natural daylight as nearly as possible. Four artificial light sources were compared for their accuracy in rendering color in comparison with an accepted standard artificial north sky daylight (7,500° Kelvin). Light sources were arranged to provide an intensity of 130 foot-candles with an angle of view of 45°. The interior of the testing booths was painted a neutral gray. The four illuminants were: Special fluorescent combined with incandescent; a combination of daylight, cool white, and blue fluorescent; cool white fluorescent; and daylight.

Keywords: Crop Production/Industries; Marketing; Research Methods/Statistical Methods (search for similar items in EconPapers)
Pages: 30
Date: 1963-08
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Persistent link: https://EconPapers.repec.org/RePEc:ags:uamsmr:313304

DOI: 10.22004/ag.econ.313304

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