A method is described by which it has been found possible to determine satisfactorily the spectral energy distribution for luminous surfaces whose brightness is only a few footlamberts. A standard spectrometer is used in conjunction with a photo-multiplier tube. Relative energy is found by direct comparison with a tungsten lamp calibrated for color temperature. Results obtained with this arrangement for various fluorescent lamps are in good agreement with measurements made on a large double monochromator, indicating that the scattered light in the single prism instrument does not introduce serious errors.
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Frank J. Studer (1947) studied this question.
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