  We test for evidence violating the duality invariant ratio of photon beam
irradiance and wave intensity. Split beams from a 633 nm HeNe laser are
intersected at a diffraction grating complementary to the resultant
interference pattern. An output beam from the grating, depleted in irradiance
relative to wave intensity from the perspective of local realism, is
transiently intersected with a beam from an independent HeNe laser and measured
irradiance is amplified by ~4% in conflict with quantum mechanics.
