Meet the Lume Cube: a Bluetooth off-camera flash and video light for your iPhone, Android, DSLR, and digital cameras. You get 1500 Lumens of 6000K light per cube and can adjust brightness via your iOS or Android device. Lume Cube is waterproof down to 100 feet. You can sync multiple cubes conveniently.
These lights have a Strobe mode. You can control up to 5 Lume Cubes at the same time. Costs under $80 at this time.