> > powerful flash may be reflecting off the walls enough to blur the shot
>
> I'm confused about what exactly you're trying to accomplish

Just a simple set-up to get some idea of how bright different flash tubes
are and how the value of the storage capacitor affects flash length

> bouncing off walls does not meaningfully extend the illumination time

Yes, that's true. This was in quite a small room, barely 3m square. What
I intended to suggest was not time effects, but whether the walls act as
reflectors and add enough to the illumination to cause more visible blurring

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