That's what I was thinking, the water quality is going to produce an effect based upon the same factors that effect ambient, but potentially manifest differently within the artificially lit area. I've shot underwater for years, but rarely used lights as the diving I do in Hawaii is relativity shallow and clear. The magic of filters and post correction usually makes the subjects look more colorful than I even see through my mask. The times I've used lights, I didn't use a filter due to the undesirable colors produced in the lit area, but then anything out of the light cone looked a lot different. After reading about the idea of shooting RAW underwater without filters, it just got me thinking about how RAW acquisition might enable a UW shooter using lights to make the transition between foreground and background less obvious. Maybe use a less aggressive filter to help some with the mid/background, but still within correctable range in the foreground artificially lit area? I guess I'll need to get my rig underwater and figure this out for myself, but thanks for your thoughts in the meantime.