determining HOMO and LUMO levels from cyclic voltammetric

[nad]

Hello everyone

i have a curve of cyclic voltammograms (current Vs Votlage) that represents reduction and oxidation potentials of each component of my product (if i have understood correctly)

I want to understand how to determine LUMO and HOMO levels from the curve and from those 2 relations:

E_LUMO=-e (E_onset,red +4.75)

E_HOMO=-e (E_onset,ox+4.75)

Thanks in advance