I was down in SoCal this past week for a couple showings of the video and I stopped by the kayak polo session at UCLA. The games are at night at a pool with relatively poor lighting - visitors always complain they can't see the ball. Once you get used to it it's really not so bad - but I didn't know if video would work. So I decided to test the new HD Sony I have - special low light function, full on night mode and even super slow motion. The results are actually pretty good and if it works this well in the dark it should handle the shadows of the river canyons without a problem (hopefully I'll get out on some whitewater next week now that I'm back in Folsom).
Enjoy the playing in the dark: