That 1100 looks like decent value. Any idea how current draw compares at max output? The 1600 is stated quite a bit longer burn time than the 1100 (2.5 vs 2.0), but at 600-650 lumen, the specs look more similar. Any idea whether that stated 2.5hr burn time is real?
I can't comment on that because I don't know the run times in real life. I believe @stuartv said the 1600 self dimmed after a while. I think for me it's not really an issue. Either light will last for 2 1hr dives easy, and if doing more I would just change the battery.