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I have been using Peter's light boxes for quite a few year. I normally expose to get around 29,000. I have also used CCDAP to do dusk and dawn flats. I have found somewhere around 25,000 to 30,000 works well overall. Sometimes combining flats from 21,000 then 25000 and then 31000 can give a good flat too. Everything is about experimentation.
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