The main reason I would like a more consistent figure is that, having adjusted an image's colour balance to suit my taste, I would like to know what to set the camera to, to replicate that result without needing post processing, so reducing the number of adjustments needing to be applied during the initial sorting process. This would be easy enough using the same light source on land just using trial and error, but adjustments underwater are not so easy, so the ability to make an adjustment based on what previous shots needed would be great. For that reason closer to the camera would get my vote, if I had to choose just one option.
The main reason I would like
The main reason I would like a more consistent figure is that, having adjusted an image's colour balance to suit my taste, I would like to know what to set the camera to, to replicate that result without needing post processing, so reducing the number of adjustments needing to be applied during the initial sorting process. This would be easy enough using the same light source on land just using trial and error, but adjustments underwater are not so easy, so the ability to make an adjustment based on what previous shots needed would be great. For that reason closer to the camera would get my vote, if I had to choose just one option.