Characterization of the light source was performed via
the Mightex spectrometer described in the previous section.
The initial Tungsten spectrum centered at 650 nm showed a
shift of ~100 nm toward the blue region after incorporating
the daylight filter (orange curve in Figure 3a); wavelengths
above 700 nm are not affected by the daylight filter, and
therefore, a FM 01 hot mirror is needed to attenuate the
unwanted NIR band (green curve in Figure 3a). A direct
comparison between the proposed light source with and
without filters and the solar spectrum is presented in Figure
3b. It should be noted that Tungsten lamps are depleted in
UV and blue wavelengths and consequently a complete
match between the solar spectrum and tungsten lamps is not
feasible. However, the excess of radiation at wavelength
above 550 nm can always be corrected using additional
filters such as FM-02 and are currently under investigation.