Photons are not light but they carry light, in a round about way. Only by interacting with orbiting valence electrons are light quanta brought into existence. Photon is a particle that carries energy and since it is self-propelling (post "Ladies and Gentlemen, We Have Light Speed!"), it regains its lost energy , and so, itself does not change in the energy processes that it is involved in. It never dies.
What is a photon???
