I would like a little advice.
Explanation of the problem:
I want to photograph dancers moving and jumping mid-air on a white background. I understand that to freeze action without blur, it takes a flash duration as short as possible and this is inversely proportional to the flash output. Using Speedlites is more or less an option since I'll have to shoot over a period of 8 hours and that besides the cost, it will not be practical to spend my time charging batteries. I have a couple of low end Opus studio flashes (OPL-H150 and H250) which are fine for my usual portrait work, but I'm pretty sure that the flash duration is not suitable for my application. This has yet to be tested, but the duration is not even listed on Opus's website, which does not inspire great confidence.
I can rent a Profoto Pro-7b 2400w/s kit with two heads (also thinking of using a 210 giant silver reflector), which will be my key light and my rimlight. Can I still use my low-end flashes to ensure my background is blasted without causing blur to my subject?