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An experiment in circuits... with lasers (v1.1)

Cave Johnson here, well not really but it makes everything better if you read this in his voice so do it, and do it now!
This fine puzzle takes away all the old crap of the old one, and makes it better. In every way. And I mean it.
You really still have no idea how those lasers stay on unless you understand that demo bit at the end but its science, not everyone gets it. Except you, its your job.
Now go reflect those death rays, I mean err, testing beams and quickly! Wasting time on two earths here, and I'm not paying you double no way.