Thanks ksoc,

I took one of the target circuits and hooked it up to a relay to a smoke unit from Micromart. So when it was hit the unit would let off some smoke. The smoke generator isn't that quick and it's only on for the duration of the LEDs. Maybe a faster smoke unit would work better. There are some Xenon flash kits out there that aren't too expensive, one of those for a flash effect can probably be connected pretty easily.