In classical QM, using a photon to measure the location or momentum of an electron collapses the electron's wave function at the point of measurement, which then, over time, spreads out again (what I'll call "diffuses"). Fine. The question is: Does the energy of the measuring photon change the time course of the diffusion process, and if so, in which direction? I.e., does a higher energy photon lead to a faster or slower diffusion, or no change at all? Does the answer differ if the energy of the measuring photon is increased by virtue of wavelength (i.e., more blue) v. being multiple coherent photons at the same wavelength (e.g., from a laser)?