I see my light come shining, from the west down to the east.
That's hardly a steal from 'I see the light shining all around' or whatever, is it.
And 'life' would make no sense at all.
I once heard it explained that, if you're a prisoner in a cell with a little window, then the sun moving round the sky from east to west means that you get a patch of light moving round your cell from west to east. Makes sense to me, and quite a poetic image.