Electromagnetic spectrum is coding, Photons at long distance can be light photons or dark photons , the dark being those that send code as bonding energy which are not intercepted at any great distance away from where coding is pratical.

yes the coding effects of electro magnetism is of practical consequence where undetected between atoms and subatomic particles.  The coding serves a definite purpose at close range as bonding and it is coded because bonds are communicated not just from one atomic / subatomic particle to another but from both to one an other.  So it is broken  bonds that produce what we "see" as photons in the em spectrum.  starts sounding a bit corny and it really is.  We should have suspected such after the discovery of how DNA works.  With DNA there are strong and weak bonds involved but rarely any photons discharged as the photons are involved but are involved as dark photons at short ranges.  Fire breaks bonds of molecules and from that we get visible light and other photons. Those photons in the right dense material would never surface to travel outside the mass they were in and would have a practical purpose possibly so they would never otherwise be emitted to become visible at some greater distance .