Thank you for your very detailed analysis of energy and the speed of light. How ever, I cannot agree with the following statement. "This is another significant result for it suggests that: although the energy content of the photon is the same for all observers, the distribution of that energy content can be different for different observers." The energy of a photon is not the same for all observers. It is changed by a red shift or blue shift due the the relative motion of the observers. What is quantized for a photon is the amplitude of the wave function. I don't know what you mean by the distribution of the energy content.