  The suppression of photon bremsstrahlung due to a variety of in-medium
effects is discussed. Different electrodynamic suppression effects are
discussed, and compared with the related color analogs. Higher order effects
are considered, and found to be important. Data from SLAC E-146 is discussed,
and compared with theory. The effect of finite thickness targets is emphasized,
since nuclear size is such an important limiting factor for the chromodynamics
effects.
