I don't see anything IMPORTANT there - not to me, anyway.
From a human factors point of view I suggest you show a light if the route leads to safety and nothing if it leads to danger. In a real fire, people would not stop to think about which colour is which. Also you need to make sure they follow the line of lights in the right direction. With conventional fire exit signs this is done by the orientation of the sign - if you can see the sign, you are facing towards the exit. I suggest you do something similar with your line of LEDs - this might need them to be partially shrouded.
You need to have a reliable and robust control mechanism. Wires leading back to the fire supression control system would be the most obvious approach since this is where you will get your information about where the fire is.