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After light is created, how does it instantly reach its speed?

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[My answer to a nearly identical question on Researchgate]
Don't think of the photon as a little bullet that is emitted by an electron. The fundamental object is the electromagnetic field. Changes in the electromagnetic field in the vacuum propagate at the speed of light. And because the electromagnetic field is a quantum field, changes (at any given energy level) come in discrete lumps, discrete quanta, which we call photons.
So yes, the photon is born at light speed. That is, the change in the electromagnetic field induced by the electron propagates at the speed of light.
Is photon born at light speed? Or has an acceleration time? - ResearchGate. Available from: https://www.researchgate.net/pos... [accessed Feb 9, 2016].
 
- Victor Toth
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