Based on [an earlier paper], I re-designed the description for an H-atom’s electron movement, the orbital transition, and a photon’s emission and propagation. We first used the "nlm elliptical orbital model" to replace the Born probability, then used the "nL0 elliptical orbital transition model" to explain all transition and emission related processes. Therefore, instead of using the electron cloud description, we moved back to the semi-classical physics’ orbital description (by using a group of elliptical orbital tracks). We narrowed the (general) QM probability description (i.e., the Copenhagen interpretation) down to the high uncertainty of the momentum vector Δp at the perihelion region of the elliptical orbital track, so that an orbital moving electron can switch (within the same nlm QM state), or even transit (between different n of nlm) between the different elliptical orbital tracks at the perihelion region. We hypothesized that during the orbital transition, the orbital electron spins-off its outmost shell of its 3D wave packet to form a photon. We hypothesized that it is the uncertainty principle ΔpΔx (that equivalent to a QM-force) that first symmetrized the 3D wave packet of a photon (from an un-symmetric newborn photon), and then further trimmed the over-grown 3D wave packet of an old photon (by splitting-out the outmost shell to form a new low-f photon). Then we re-calculated that (to satisfy Hubble constant ~70 (km/s)/Mpc), a 656.1 nm photon, after propagating each ~2.7E+10 meters (about a half distance from Sun to Mercury), it will split-out a 0.02 Hz low-f photon. We emphasized that it is the natural attribute of an old photon to "decay" by red-shifting. Thus, we may have an alternative explanation (other than the "expanding Universe") for the cosmic red-shift. (Note: this is only a citizen scientist-leveled guess). We mathematically built up a 1D-wave packet for a photon, and correlated its emission to the electron orbital movement. We also (qualitatively) described a photon’s 3D wave and 3D wave packet. Thus, we (conceptually) unified all four different kinds of wave explanations (1D-wave, 1D-wavepacket, 3D-wave, and 3D wave packet) for a photon’s emission and propagation, and also correlated it to the electron’s orbital movement in H-atom. This model revealed that a 3D wave packet should have the size about one wavelength.