Cool color LEDengins (green, blue, white) like a LOT of vf. Usually right at or more than a 7.4v pack can provide. Those packs will usually start out over 8v fully charged but as soon as a load is placed on them (turning a saber on) that will drop rapidly to 7.4 and even lower.
Two parallel series pairs off of one puck (1A puck) are splitting that 1A into 500ma each pair. This isn't even the minimum required current (750ma) that a LEDengin needs. You are starving the hell out of those LEDs
Get two pucks so that each pair will get at least 1A. In stunt configuration (no soundboard) you're probably ok with just a 7.4v pack. With a soundboard, it will 'work' but without 18650s it won't be an optimal set up at all. I have run a full power green LEDengin off of 14500s with a CF. It works, but isn't optimal.
Most soundboards have an input limit of 12v. A 3 cell LI-Ion will be more than that fully charged. Not a good thing right now. Will it work?....maybe.
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