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Hi Doug when you say 65ke I assume you mean 65k ADU right? My understanding is that a third of the full well is recommended, the full well being the value at which the camera sensor is starting to have a non linear response which in my QHY8 appears around 45kADU. In practice I shoot flats at 9~10kADU on the brightest pixels of the bayer matrix which with my EL sheet ends up in the red pixels. I tried higher values but anything over 10kADU is giving me reverse vignetting no matter how I scale/normalise to my lights.
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