# Wavelength and Colour in Coordination complexes

My textbook said that coordination complexes with weak field ligands require a larger wavelength for obtaining enough energy for electron transfer(and hence, the manifestation of a colour), but if E = hv(E is the energy, h is Planck's Constant and v is the frequency), then shouldn't the wave of higher frequency be needed?

Low spin (formed from strong field ligands) complexes result in a larger difference in energy between the $$t_{2}g$$ and $$e_{g}$$ orbitals. High spin (caused by weak field ligands) complexes are, evidently, the opposite.