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Greg, I also use one of Pete's (EXFSO) light boxes with a variable light output. I use it to get good exposure time and suitable ADU limits that I am after(20000). The glory of this system is flats can be taken each session and time is no longer a problem. The variable light output is a wonderful addition to a great light box.
I also shoot bias frames or darks and put them together as you do in CCDStack.
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