Dan
Contributor
I think you could easily take video with a head cam and a head mounted light. The problem that I expect would be back scatter from the light since it would be closely aligned with the camera.
Also, the wider the angle of light, the more backscatter you get and most head mounted cameras are going to be pretty wide angle, so you would want a similar wide angle light. In dark clear water it might work OK, but dirty water with particles, the video would probably not look nice.
That’s why I would like to see the video from such setup.