I live in Seattle and use this strapped to my gear for day dives. I bought two and after 2 years both are going strong. Only con is the batteries are a proprietary size.

http://www.amazon.com/MagicShine-Flashlight-Battery-Charger-1000-Lumen/dp/B005657PD4/ref=sr_1_1?ie=UTF8&qid=1429571244&sr=8-1&keywords=magicshine+scuba