Abstract

Abstract In the paper by Schmalwieser and colleagues, the irradiance on the wall of a cylindrical UV reactor for water disinfection was measured. This is a useful way to measure/evaluate such UV devices. However, this measurement is not a solution for measuring the UV emittance of low-pressure-lamps. In fact, throughout the paper, the method and the emittance measurements that the title claimed were not really provided. The title of the paper claiming to be a ‘standardized method to measure the longitudinal UV emittance’ is misleading.

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