[kurlberg]

I don't know if you want a hint, but... If you do it the right way, no tweaking is needed at all. (The puzzle can be viewed as a very nice illustration of ergodic trajectories.)

[dexter313]

infinite power!

http://imgur.com/AbvXE

[byronknoll]

In case people are curious, the reflection limit per laser is currently set to 500 to avoid infinite loops.