  We discuss tests of the Einstein Equivalence Principle due to energies which
are purely quantum mechanical in origin. In particular, we consider using Lamb
Shift energies to test for possible quantum violations of Local Position
Invariance. (to appear in the Proceedings of the 5th Canadian Conference on
General Relativity and Relativistic Astrophysics, University of Waterloo, May
13-- 15, 1993) (acknowledgements changed to correct an omission in the
originally submitted version)
