make lite flowing Branched network

hello everyone i want to create a branched network of a discontinued lite who travel in transparent tubing (my network)
and pute valves in some branch to close and open
i begin with ue4 so i need just to know from where to start this pls helppppppppppp

peace

English translation:

I want to create a branched network of transparent optic fibers with valves.

My thoughts:
Not possible with the lights.
Possible with material (self illuminated one).
Possible with particles.

and how to do it with material ??