I would suggest looking at using a relay.
- They don't require a lot of current to energize
- They provide circuit isolation
- They can source a lot of current from your supply
It seems like they suggested this as a possible option in their response.
I'm not familiar with the FTC rules myself, so I can't comment to its legality.
Relays can be sourced locally at
radio shack. You probably only need a SPST relay.
It looks like the HT SuperPro has 3.3v outputs, so you wont be able to drive the relay directly. Luckily there's lots of circuits online on how to control a relay from a microcontroller. Like
this. One modification to the circuit on that page though - I would suggest adding a diode across the relay coil as shown
here.
This page will help you pick your R values.
Common diodes
1N4004, 1N4001
Common NPN transistor
2N3904
This relay should work if you're switching 5volts to the LEDs.
This one if you're switching 9volts to the LEDs.