A kinetic-measure was developed to explain time-resolved observations during the overall decolorization of organic dyes. Critical photonic times (CPTs) were calculated for the photocatalytic degradation of four organic textile dyes. Three different frequencies of UV were applied to the dyes. Use of CPT principles improved decolorization by 100%. Moreover, CPT calculations predicted dye resistivity and allowed the assessment of photon efficiencies and deficiencies in dyes and UV lamps combination. The derivatization and evaluation of CPTs from the slopes of the linear plots are presented.