Re: Any lights using 123 \'s totally waterproof?
Sorry to be the 'what do you mean by totally waterproof?' guy... as a diver, I consider a dive-rated light to be one rated to 500', about 3x maximum recreational diving limits. The one thing you don't want in a dive light is to be diving at 100' with a 100' rated light, and even with a 500' rated light, dive lights flood from time to time. If you're taking it in the water, 'Two is one, and one is none... '
Soooo, I think of water-resistant lights that aren't dive-rated as being good for rain or splashes, and if they live through a dunking, I'm lucky. If it's rated for less than 100', I consider it a fine light for submersion, but not to take to depth.
I'd say a 100m (~300') rating to be the minimum for a 'waterproof' or dive light.
All that said, even the non-water rated surefires do just fine in a one-hour dunk on the floor of my hot tub. My personal minimum (I live and work around the water) is that a light survive this test before it becomes a part of my tool kit, and every surefire I own, including the decidedly non-water-resistant G2 has done fine with this. YMMV.
My Arc LS, Firefly II are in the water all the time, I don't yet have the Pelican M6, but that light would be my first bet for a more-water-resistant-than-usual 123 light, as Pelican does dive and hazardous-atmosphere lights for a living.