comparison of the two concentration response curves, obtained in the presence and in the absence of UVA/vis irradiation, either by calculation of the photo irritation factor (PIF), or by calculation of the mean photo effect (MPE),
primerjava dveh krivulj koncentracija-reakcija, pridobljenih v prisotnosti in odsotnosti obsevanja UVA/vidne svetlobe, in sicer bodisi z izračunom faktorja fotoiritacije (PIF) ali z izračunom srednjega fotoučinka (MPE),