If you want the background to be overexposed, you will need to make your backlights brighter, meaning the background is overexposed and the subject in the foreground. You will need to measure the light levels using a light meter.
You will shooting using f 8, which is what your key light is set to, therefore you must set the backlight to f11 or f16, as this is one or two stops more exposed than the key light.
there is a significant lack of information in your posts, I think you will need to come in on the 20th, 21st december to catch up...
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