Cygolite Hotshot has "waterproof" or "weatherproof" listed as a feature on their website. I have a Hotshot, and while the beam is narrow, it does spread out quite a bit with distance, at least 2 lanes wide, at a distance of less than 200 feet. In fact I was turning left at an intersection the other day in the middle of the day time, and a lady turning right said that my flashing Hotshot light was very helpful.