I created a wiring diagram for those who only want a single switch but want full power to their LED. The porblem is the cheap toy hasbro boards don't put out enough current for most LEDs. If you want the 1000ma or even 1400ma it takes to run most LEDs you need a separate circuit with a separate switch. I used a relay for the second switch which is powered by the board. See attached diagram. Be careful to check how much voltage your hasbro board will take. Some are ok with 6v, but some people use 5v regulators to be safe.
hasbroRelay.jpg
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