Fig. 1.
UV-visible absorption spectra of Irgacure 2959 and LAP in ultrapure water superimposed on the fluorescent UV-A light source emission spectra normalized to the UV-A emission peak. The LAP absorbance peak at 370 nm matches the UV-A emission peak of the fluorescent light source. Irgacure 2959 has tail absorbance in this wavelength range.