The method to measure the UV emittance of low-pressure-lamps: a commentary on

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.