...it's stated that in the event of an evacuation guide lights will illuminate on the floor...
and the (important bit left out):
...and guide you to an exit.
But the bit that puzzles me is how exactly will they guide you to an exit. I must be stupid because all I think they will do is show you where the aisle is. So as you approach the lights, say on your hands and knees in darkness, in thick acrid smoke, your exit will be either to the left or the right. Errmm... And that's the bit left out.
Returning to the initial post, you will see them if you fly at night after the cabin lights are dimmed/turned off before departure/landing.