Okay, this looks fairly simple....I believe the orange is the positive for the lamp or in your case now, the led, and should also be shared by the positive to the batteries. The blue should be the negative for your led. The black like you have said is for the battery negative. This set up is very similar to the old Qui-gon Jinn soundboard from the 1999 toy of the same name. The swithes going to be a bit difficult for you, as you'll have to solder wires to the traces on the board underneath the black rubber button. It should look like this underneath the button:
You'll have to solder wires for your momentary button to the traces on the board. This pic shows an old Vader board that had the button on the board as well. The white wires are the switch wires.
As a caution, I would suggest that you DO NOT give this soundboard any more than 4.5 volts, as it was intended to run a light bulb similar to a flashlight, correct? I'm assuming it ran on two C batteries? you should be able to run a Luxeon III directly from the sound board.
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