The excitation spectrum demonstrates that for an effective luminescence notonly the presence of emitting level is important, but also of the upper levels with asufficiently intensive absorption. The excitation spectra enable to choose the mostlyeffective wavelength for luminescence observation. The combination of excitationand optical spectroscopies enable to determine the full pattern of the center’sexcited levels, which may be crucial for luminescence center interpretation, energymigration investigation and so on. The main excitation bands and lines of luminescence in minerals are presented in the Table 2.2.