I have a Petzl Ultra - I'm not sure the exact name of the model, but I'm impressed with the lithium battery and how long it lasts. Seems very rugged and has survived dense rain, and snow but I've never dropped it in the water. It's a bit on the heavy side, so I was optimistic about the Surefire which I think is lighter, and I have always had great success with older Surefires.
I had a bicycle light- Light-in Motion model 200, I think it's name was, that was actually pretty bombproof, and lightweight. It was stolen when I ditched my pack to respond to a heart attack with an O2 tank and AED and had to lighten my load- somebody stole my pack and I lost that light- which actually I think seemed more bomber than the Petzl- and a GPS unit, and a uniform jacket, sleeping bag, and bivi sack, among other things.
I also have a Lupine halogen - not sure of the name but it's not made any more- so I'm saving up for maybe another Lupine model if the Surefire really doesn't work out. As a backup I use the Black Diamond Storm- which so far as survived a number of nights in the snow- not in New hampshire where I work but on vacation in the Andes- in NH we didn't get much snow this winter. So, I'd rank the high output headlights, in terms of being bombproof:
Light in Motion
Petzl Ultra or Lupine
Black Diamond- waterproof but not as beefy as the others.
I also carry a few mini coleman headlights- el cheapo but very light weight- afterall there was a time when the 3 LED Petzl Tikka was all one really needed for most rescues or for alpine climbing.
The need for more throw and flood, now that it's available, isn't overwhelming- In fifteen years I've never ever found someone with a bright light- oddly called in this forum "the SAR light" because in New Hampshire the trees are so dense that for most of us it's always been with air scent dogs or a whistle or a FLIR on a helicopter- but still it's nice to be able to light up an area to see if it'd make a good LZ, or light up an area in front of a litter team to figure out where the trail is, or where there are various obstacles such as downed trees and waterbars. Oddly, I think the most important thing it does is makes it clear that I'm in charge! Sometimes after an exhausting rescue I don't want to have be yelling at people- rescues work much better when people cooperate and aren't overly driven by testosterone. Slow is smooth- smooth is fast, and I'd rather keep it mellow and not have to deal with people who think they're in charge when they're not- we call it the Mr. Rescue syndrome. So I think lumen firepower is actually similar to other ways of asserting authority- a badge, a gun, etc. - it helps assert authority.
The other use of the new breed of LED lights is unrelated to SAR - it's in park law enforcement- coming on a campsite where people are rowdy and drunk and disturbing others- and I'm alone-they can't see me because of the campfire- an insanely bright handheld light to the eyes has a way of sending people scurrying to their tents. I turn up my radio volume and they don't know much but they know I'm not alone.