what a pity that up-to-that-point excellent video then digressed into Red Shift and Big Bang PROPAGANDA.

Remember, this single source expanding universe theory is nothing more than that, a theory.

So, there's a red shift value to older light?

Well, light could just 'get tired' or 'otherwise depreciate' over billions of years to the more slackened, red shifted, or less intense, end of the em spectrum via known entropy.

If light 'red shifts' over time, it would still indicate distance (depending on the rate of red shifting, which we haven't yet measured because all our measurable light is LOCAL) as it's been travelling a long time, but it would NO LONGER be associated with this insanely illogical 'big bang' creationist moment in what used to be called Science (big S).

:)

And it depends how you 'view' light, whether you believe it's a distinct PACKET of energy in no medium, or (like me) you believe light is the ENTIRE UNIVERSE moving down one square on the great big galactic TETRIS game.

[link to mikephilbin.blogspot.co.uk]