CCL: Is the energy of HOMO and LUMO extracted from DFT or TD-DFT calcs?



 Sent to CCL by: "Mo  Fateh" [mo.fateh : yahoo.com]
 Dear CCL Members,
 I am working on the modeling of Organic photovoltaic cell for the first
 time. I am confused:
 1- Is the energy of HOMO and LUMO extracted from DFT (ground state) or TD-
 DFT (vertical excited state) calcs? I want
 to compare the HOMO and LUMO energies with those estimated from cyclic
 voltametry technique.
 2- When I should use the energies of HOMO and LUMO of ground state and when
 I should use them in the excited state molecule?
 With thanks,
 Mo