Because of the variability in the output of the xenon lamp in the Atlas xenon Weather-Ometer, daily monitoring of the ultraviolet energy output is advisable. The monitoring device recommended here is a barrier-layer cell behind an interference filter with a transmission peak near 328 mμ. The device is calibrated in terms of irradiance units at 328 mμ per mV reading. The primary standard is a tungsten ribbon filament lamp issued by the National Bureau of Standards under the designation “Standard of Spectral Radiance for the Region of 0.25 to 2.6 Microns”.
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Eugene Allen (1965) studied this question.
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