[pfdietz]

Yes, you are talking about a tired light theory. You are talking about a theory that robs energy from photons (never mind there's no known physical way to do this that doesn't scatter them, which isn't seen) but does not also stretch out the time of other physical processes, and stretch out the space containing the photons.

What you are proposing is ruled out by the generic argument against all such tired light theories.

I'm getting very strong crank vibes from you now.