I took this off my back deck 10 minutes ago.
1DX, 24-70 II, 10 sec @ f/11, ISO 200, tripod.
With the motor drive engaged I locked the shutter with a cable release, firing the camera repeatedly in 10 sec intervals. Lens manually focused at infinity. You can make the shutter longer 20 or 30 sec. intervals. Longer exposures increase noise and a chance of picking up ambient light. You can also use Bulb setting. With longer exxposures you can capture multiple strikes.