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Assume one first accepts the evidence that I have put forth before that the universe is a 4-sphere scaled numerically by $1/h$.  Then the geometric infrastructure includes a spin structure, the Dirac operator and the spectrum of the Dirac operator (computed for example by Christian Bar) which are integer multiples of $h$.  We can safely conclude that quantization of energy is therefore determined when we can formulate a Dirac equation for a photon.  A Dirac-like equation for a photon has been known since the work of Ettore Majorana discusses here.  This is an issue I had repeated often since 2008 perhaps without sufficient justification but I hope the reasoning is clearer now.