Depending on the photon energy, you will get information about the band energies (as in XPS) but with a much higher energy resolution (UV-lamps have a FULL Width Half Max. of some few meV, while a laboratory X-ray source typically has about 0.5 - 0.7 eV). You will in addition get the work function of the sample from a data evaluation! Hope this is what you expected to get, Dirk