I have a pair of (old) Luna-8 CRI. Maybe 6000 lumen or less. Before of these I had a pair of FIX 5000 lumen.
I was satisfied with my FIX except for lumne output. I mostly do tech dives with older camera and more (light) is better. Nowadays I thing that 6000 lumen is the bare minimum.
Despite of light power I love my Keldan. I cannot say that in water the light is different but I realize that since I use them my video colors are nearly ok out of the camera. I mean that I spend less time in post to get colors right (err, actually colors I like).
Now with newer camera you can easily work at ISO 1600 and beyond while on my camera ISO 1000 is the highest I can afford.
I agree that on shallow waters you need very high power lights. I find deeper shots quite easy because you have just to manage light output and nothing else. On shallows shot it's very tricky to get good color rendering.
- Laval likes this