The UV light source consisted of a LC6 Hamamatsu mercury lamp, which supplies radiation of wavelengths from 250 to
600 nm. The second UV light source was Hamamatsu UV LED with maximum radiation at 365 nm. The spot light diameter
was about 8 mm. The measured light intensity at the sample during processes was 4.5 and 20.0mWcm2 for mercury and
25.4 and 49.1mWcm2 for UV LED source respectively at the wavelength range from 250 to 450 nm.