Instrumentation programs for the careful measurement of spectral energy distributions emitted by luminescent materials have been an important part of Sylvania's research activities for a number of years. Accurate knowledge of these properties is of value not only in the study of the fundamentals of the luminescent process, but also in the development and manufacturing control of the phosphors used in fluorescent lamps and in cathode‐ray tubes.The objective of this paper is to describe a pair of automatic recording spectro‐radiometers developed for the two foregoing products. These instruments have been installed in phosphor development laboratories. Their construction, operation, and uses are critically discussed. Both instruments provide for the direct measurement of spectral energy in the region between 7200 and 3600 Å. The fluorescent lamp spectro‐radiometer plots a permanent record on a chart in 12.5 minutes while the cathode‐ray tube instrument performs the measurement in 48 seconds.
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