I agree that the Photon is the way to go. I have had a P2 for a couple of years and recently bought a P3 even though there were some quality control problems with P3s for a while. <br><br>It seems the problems are mostly ironed out now and my P3 works perfectly and is a terrific light. If you are considering the Photon, don't rule out the P3. It is water resiatant, easy to turn on and off, and has some neat "modes," some of which are very useful. For instance, the medium and low modes really extend battery life and are less disruptive to night vision. The flashing modes could be good as a distress signal or hazard light. It is possible to accidentally turn one on, but I haven't had any problem with that and it doesn't seem like there is any problem with the design that would make that too likely (unless you are really rough with it, such as putting it on a huge nest of keys and throwing the keys around a lot). I highly recommend the P3.<br><br>By the way, a P2 can survive a dunking in water, but you should open it up and dry it out afterward. The silicone grease trick mentioned in this thread is intended for the P3 to enhance it's water resistance. I don't think it would work well on the P2 since the case is open. <br><br>These are definitely not the most powerful lights you can get, but they are the tiniest and have a completely useful level of light output (assuming you are not trying to illuminate anything further than about 20 feet). They are perfect for a small PSK or for everyday carry in a pocket.