[baudrunner]

Refutations of "Tired-light theory" are based on the assumption that the photon is a particle responsible for illumination and it travels across vast distances unimpeded until they strike the eyes, whereas in reality we exist in a quantum Universe comprised of localised deBroglie wave interactions where a photon is merely represented by the amount of energy required to effect a transitional/semi-transitional change in electron cloud behaviour - ie. oscillation of the outermost electron shell/cloud. Your eyes are merely EM wave detectors tuned to the visible range in the optical spectrum and light hue and intensity are just interpretations of the brain as a function of EM wave characteristics modulated on the particles of the transmitting medium. Hysteresis effects are measurable in the laboratory and need to be accounted for in engineering. The Universe is just one great big laboratory.