Caves eat light, the more the better. Most of my videos have been shot with Light Monkey's 35W HID with video reflector and their 12W LED. Sometimes I'll use helmet mounted 2 cells if warranted. There are tons of solid video out, this is my best work in my opinion.
https://www.youtube.com/watch?v=jXyzrxgn_AQ
https://www.youtube.com/watch?v=jXyzrxgn_AQ