The progressive redshift to light as it comes out of gravity is really
the expansion of the light wavelength size. Near the event horizon of
a black hole the size of light coming out mathmatically moves toward
infinite wavelength or infinite red shift. But there is a problem with
this growing size. It is going to get bigger and bigger. What must be
explained is the size of the wave must grow at the speed of light
until it reaches the full size of its low energy.

Light is a local phenomenon thus near field EM photonics and the idea
of growing light waves. For imaginations sake take an ultra low energy
light wave emitted close to a black hole. If by size it is as big as
the solar system it could not appear all at once. That would require
instantaous creation accross all of space. If Einstein is right it has
to be a local phenomenon starting small and growing at light speed. In
other words it is waving at light speed.

Mitch Raemsch; Falling light changes colour