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The Knog Qudos Action Waterproof Video Light is waterproof to 131', so it can safely go just about anywhere your camera does. It features three Cree LEDs, which combined produce an output of 400 lumens at full brightness. There are three modes to cover different lighting scenarios plus two brightness settings within each mode, and it can run for up to four hours on a single charge.
The included battery is interchangeable, and charges via micro-USB. The light weighs 5.3 ounces, meaning it can be easily mounted alongside the GoPro using the included mounting hardware. Included is a GoPro bracket that works with nearly any standard three-prong GoPro mount, as well as a cold shoe/tripod adapter for using the light with other cameras or on any 1/4"-20 mount.