Thank you for all your many and varied (and off topic) replies.
Many of you say that light never wears out. Yet, light is always being made.
Does that mean 'Space' is getting lighter (brighter)?
If, as some of you believe, the Universe if finite, that means we will eventually be flooded by light.
Sorry, I can't go with all that.
If light was to last forever, it would have to travel on forever to 'not' brighten space. Hence an Infinite Universe, but that is another topic.
Even still, somewhere in the back of my mind is the nagging belief that light does eventually wear out (or redshift) (or alter in the radiowave spectrum).
'Dark' runs out when 'light' enters it, can 'light' run out when 'Dark' enters it?