I think light does not accelerates instead reaches it required speed because of its massless condition.
The term photon was given because of the way it interacts with matter (bending, relection speed limit etc) but it real nature is Electro-Magnetic radiation ie. radiation that come from a source (Supernova, energy release from a source including Radio, Gamma rays etc). Electromagnetic radiation is the key to understand lights real nature.
Correct me if I am wrong.
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