“For the operation of the 10 mm Al2O3 electrode, it was determined after a spectral weighting of the radiation according to the physiological effectiveness that a daily treatment using the same parameter set of 22 hours appears harmless. Since there were no significant differences in the spectral distribution of the two experiments and the intensities when operating with the flexible injection-molded electrode are many times lower, it can be assumed that there is no regulation of the daily treatment duration due to the plasma UV emission during the treatment results. “