Figure (a) shows the raw spectrum of the LED source obtained with a laboratory grade UV-Visible spectrometer (Goyalab Indigo, France). The emission spectrum of the LED ranges approximately from 420 to 700 nm. Consequently, the counts detected by channels F1 -415 nm and F9 -910 nm (Table .3) are likely to arise from measurement noise, as mentioned below. are observed between the "ideal" spectrum and the one measured with the multichannel sensor. These distortions are inherent to such devices and arise from factors such as optical interferences, imperfect filters, and internal reflections. These issues result in spectral responsivity overlapping not only with adjacent channels but also with others further along the spectrum. Whereas the reference division in (1) helps mitigate some of these effects, they remain significant-particularly for the F8 -680 nm channel, which exhibits significantly lower absorbance values. Therefore, as shown by the green area in Figure (b), channels F1 -415 nm, F8 -680 nm, and F9 -910 nm are excluded from further analysis for the remainder of this study, reducing the effective channel count to six, spanning the range from 445 to 630 nm.