FR demonstrate the emergency lighting sytem during the safety demonstration but as far as I'm aware they use photoluminescent floor strips which aren't really "turned on".
I have flown FR quite recently but have never seen this, and if they do 'demonstrate' it, they don't draw attention to it.
Not many airlines are keen to use the emergency lighting system in situations other than an emergency as it runs off a battery that, if I recall correctly, cannot be easily recharged.
To me, as an engineer, this would seem halfway stupid....
One, turning it on before each flight would at least check it would be likely to turn on for an emergency during that flight (known as reducing the "risk period").
Two, if the battery cannot be easily recharged, my friend Murphy tells me it
won't be recharged regularly and correctly.
Thanks, that really reassures me.....