I'm going to be working on a portrait project with film that has an effective iso around 1/2-1(so in the range of paper negs and wetplate) and wondering about using hmi's. I'd like to have a little movement posibility in the photos, but want to be able to shoot around 1/2-2 sec. I've come across some used 575 hmi par's that are relatively affordable and wondering if they'll be enough - probably shot through a piece of diffusion or two and placed as close to the subject as is safe.

Is there anyone working this way? Or is it best to give up the continuous dream, and just use strobe?

Thanks!

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