Take QED, consider the spherical symmetric solutions for hydrogen, Add a condition that the mass,charge is zero for $r<r_0$. and at $r_0$, all mass,charge. Let the Photon be a standing wave. Assume $w$ constant (the eigen value) and $w$ proportional to $m_e c^2 + 2|V|$, e.g. assume $E=K$ (true for the Bohr model). To check yourself, lookup spherical wells for Dirac or Klein Gordon. Then you get Bohrs result. You essentially will need $j_0(r_0) = \sin(k_{\text{electron}} r_0)/(k r_0)=0$, Probably you can use the correspondence principle on the spherical shell (Hence $|K|=|V|$), Also note that you can solve the standard QED by having the same $k(r),w$ as this setup (hence the same energy) by stitching infinitely many infinitesimal thin spherical wells together e.g. you have a solution $A(r)j_0(kr)+B(r)\eta_0(kr)$, that approximately have the same eigen values, coincidence?
Stefan
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