gonzogolf wrote in post #16883615
As long as your arent getting any significant ambient light contribution in your studio then the lights should freeze the motion. Unless you have the kids jumping or some other motion where you try to freeze them in full active motion you shouldnt have to worry at all. The duration on studio strobes is enough to freeze the fidgets and casual motions. But if you are wanting to freeze motion, here are a few thoughts. Shutter speed doesnt really matter as the flash duration becomes your effective shutter speed (for proof google freezing bullets in midair). Most studio strobes have their shortest duration at full power (unlike speedlites and the einstein from PCB). So if you wanted to freeze someone jumping full power would be best.
Some packs use capacitor switching to achieve faster speed at lower power too, as in speedotron packs.
Other high speed packs that operate on IGBT circuitry like speedlites and Einstein from PCB are the Profoto Pro8a, the Bowens Creo, and the Broncolor Scoro....Saddly those also cost one arm, one leg, and usually something internal.
I am not familiar enough with elinchrom, but if you have some elinchrom flash units, maybe, you also have some speedlites which can definitely free motion!