It also depends very much on the shutter speed. Dean Collins went into great details about this years ago with his Chromazones series. Essentially you can alter the color not only by the gels you use, but by the shutter. So in this case, we light the model with a flash, use an fstop needed for that and then vary the shutter speed to get the background color lighter or darker.
Cheers,
rfs
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"The map is not the Territory"
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