LED lit signs last longer. LEDs have a longer life span compared to neon and fluorescent lighting. In fact they last 25 times longer than incandescent lights and offer thousands of more hours of display time over neon. LEDs also do not risk leakage of gasses which means the lights don't go dim like neon lights can.
Way-finding signage is concerned with helping to direct you from point to point, or confirming your progress along a route. Way-finding signage in other words, is not advertising signage or informational signage such as trains arrival timetable.