There's Always Time For Cube...Lume Cube
The Lume Cube is a sealed light that can be used to take pictures with whatever action camera or smart mobile device you might have. When we say sealed we really mean sealed - the manufacturer cautions you not to open the back since if you do the warranty will leak away. Otherwise you are free to take the thing diving to 100 ft.
Inside the case is an LED light - an extremely bright one - a battery, and enough electronics to control it through 10 steps of steady illumination and a flash mode as well. You can pump the thing up and down manually with two control buttons on the top or use a Bluetooth - equipped device and an App to fiddle with it remotely.
This latter option will also give you the facility to check on the USB charging, battery status, and to control a series of the little things.
For the non-cool still photographer who doesn't want to App it, there is an on-board optical sensor that will slave off other on-camera flashes. The dark forest macro mushroom photographer who has to backpack for their fungi will love this thing. I've just taken a good shot of the cat's pre-packed dinners at 800 ISO for f 5.6 and 1/340 of a second and it almost makes me hungry for tuna chunks...
It has a 1/4" tripod socket at the bottom and I note that there are a number of mounts available for it. there's a dual - bar rig with a GoPro mount on the bottom to give you dangerous ideas.
A well-made product and a chance to do a lot more with light than you thought.