Spectrometer -- Useful for CBD/THC analysis?

The top spectrum shows the result for a high THC strain and the bottom shows the result for a high CBD strain.  A calibration procedure was used to compensate for variations in the illumination source (a 100 watt quartz-halogen lamp).  The color differences (as seen by eye) are mostly explained by the slight shift in the peaks centered around 625 nanometers -- the CBD color peak is slightly redder.

Conclusion:  I got a nice spectrometer to play with, but the idea of using Fast Blue B dye as a way to distinguish THC from CBD didn't work out.