Studies on optical lightning spectroscopy have been performed for over a century. They have focused on cloud-to-ground (CG) discharges, as CG discharges have a vertical orientation and act as their own slit, simplifying the spectrograph design. To create the spectra, prisms, gratings, or a combination of the two (termed 'grisms') are placed in front of a camera or recording device. The optical instruments were assembled to create dispersion in the horizontal direction utilizing the vertical orientation of the CG channel. While optical lightning spectroscopy has been performed since the start of the twentieth century (Salanave, 1961, and references therein), studies seeking to calculate the physical parameters from the spectra were not performed until the

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