Kinetic luminosity of UFOs in this (blue stars, based on the most conservative assumptions) and published (red crosses) works versus the Eddington luminosity. The grey circles, triangles, and diamonds correspond to UFOs, non-UFOs, and WAs in Tombesi et al. (2013), respectively, for comparison. The transverse lines indicate the ratios between the outflow kinetic luminosity and Eddington luminosity of 100% (solid), 5% (dashed), and 0.5% (dotted).