  The vast research conducted on Nitrogen-Vacancy (NV) centers in diamond in
recent years opened the door for a wide range of NV based applications.
However, some properties of the NV center dynamics and energy levels remain
unknown. In this work, we propose a charge conversion pulsed sequence scheme
for locating the NV center singlet manifold energy level, by multi-color
excitation using a tunable laser. We present two approaches for readout -
photo-induced current and NV$^0$ population - and discuss their efficiency for
different regimes in the relevant spectrum.
