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Summary:

The wavelength of light from a moving source is red shifted which means that the wavelength has increased and the quantity of energy arriving per second at a relatively static destination is less than the quantity of energy emitted per second at the source.
If so then the original quantity of energy emitted (the message) takes longer to arrive in full than it would have done if emitted from a stationary source implying a true velocity of c  n.
Main Question or Discussion Point
The wavelength of light from a moving source is red shifted which means that the wavelength has increased and the quantity of energy arriving per second at a relatively static destination is less than the quantity of energy emitted per second at the source.
If so then the original quantity of energy emitted (the message) takes longer to arrive in full than it would have done if emitted from a stationary source implying a true velocity of c  n.
In other words the true speed of a beam of light should be considered in terms of the time it takes for a quantum of light at the wavelength emitted to be received at the destination at the same wavelength or (if the wavelength has changed) the equivalent amount of energy emitted.
If so then the original quantity of energy emitted (the message) takes longer to arrive in full than it would have done if emitted from a stationary source implying a true velocity of c  n.
In other words the true speed of a beam of light should be considered in terms of the time it takes for a quantum of light at the wavelength emitted to be received at the destination at the same wavelength or (if the wavelength has changed) the equivalent amount of energy emitted.