I may have this wrong, but I'd reason this way. You want to expose long enough to just not over fill the camera wells. If you take a lot of shorter exposures I think the read noise will increase and I'm not sure the final result will be any different (other than noisier). The ratio of LP vs signal will always be the same so I cannot see how shorter exposure would "fool" the LP somehow to stay away from your camera wells. I'm sure others will correct me if I'm wrong!
Peter
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