We present an analysis of the velocity space of a sample of globular clusters ( GC ) with absolute proper motions .
The vertical component of the velocity is found to be correlated with luminosity and galactocentric radius .
We divided the sample into two luminosity groups above and below the peak of the luminosity function ( LF ) , M _ { \mathrm { V } } = - 7.5 , for Galactic GCs .
The two groups display different kinematic behaviour according to the first and second statitical moments of the velocity distribution as well as distinct velocity ellipsoids .
The velocity ellipsoid of the high luminosity clusters is aligned with the symmetry axes of the Galaxy , whereas the minor axis of the Low Luminosity group is strongly inclined relative to the Galactic rotation axis .