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S12 looked like it was brighter at closer distance , but s20 had a better columnated beam that was reaching further. S12 lasted about 1.5 hr, while s20 was still going strong at 3 hrs (I could see red blinking around the switch by then, so I assume it was about to give out, but 3 hrs of continuous light on full brightness is all I would need). I was impressed by It’s performance in the pool and can not wait to try it out in the open water. I spent $10 extra to get a red one (not sure why I did it, but I guess it had to match the little brother )Oh. Good to know. Do you have a comparison of brightness for S12 and S20? Can you please share the pic.here ?