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The absolute energy of the light (ergs/cm2 per r‐unit) and its spectral distribution have been determined for four different types of x‐ray fluorescent screens: Patterson E‐2, Patterson B‐2, Patterson D, and Neossal. The investigation was performed in accordance with an objective spectrophotometric process with the aid of a tungsten ribbon filament lamp as a standard, a light attenuator of reflection type, monochromator, multiplier photo‐tube, and galvanometer. The application of the method employed to the weak light intensities in question is made possible on account of the enormous light sensitivity of the multiplier photo‐tube and the possibility of reproducible continuous variation of this sensitivity within very wide limits. The method has proved speedy and accurate and appears to be well suited for investigations of similar character, within the spectral range which may be measured by the commercial types of multiplier photo‐tubes.