[EricH]

The first question I have is, did YOU find any rules against it? Or Q&As?

If not, then it's quite probably legal, if done right. That "done right" is the hard part.

Lasers: Any laser more powerful than Class 1 would be ruled illegal by the inspectors (R8). But, you're looking at LEDs instead, so I suggest looking at the Custom Circuit rules.

Which latter items indicate that you'd be legal if you didn't violate R8's rules on interfering with other robots, or the various rules on power sources and voltages found in Section 4.8.