I am planning on picking up some Keldan 8x lights this year, but I'm stuck on which model to pick up - the 12k flux or 8k CRI model.
I plan to do video in a mix of environments - largely cave and reef. And the reef will involve a significant amount of daytime use, possibly even with the cyan filters.
Being honest with myself, I likely don't NEED the 12k lumens from the 8x flux, but what I was hoping for is the ability to extend the duration of the light without needing a battery change by dialing the light down. For cave rebreather dives, run times can be rather long, and I didn't think that 45 minutes of burn time would quite cut it, otherwise the 4x with 7k lumens would likely have been enough.
Anyway, with keeping in mind that I was planning on running the lights at the second highest setting to keep light durations longer, it makes me a little hesitant to get the CRI model of the light, because of the drastically reduced lumen output. Certainly I don't NEED 12k lumens - although in bigger cave passage, there are certainly times I would like to dial it up. My concern is that the CRI version only has 8k lumens - and that is a big drop from the 12k on the flux version. Not only does that significantly decrease the available light output for big passage, but it makes me worried that I won't have enough headroom to decrease the light output for the majority of the dive to extend the burn time.
I have no doubt that the CRI version will make for some pretty video, especially on the reef. I just don't know if the lower CRI flux version will also be good enough. I am sure there are apparent differences in a side by side comparison, but I really don't know if I would see the difference without a direct comparison - I have never had the chance to work with high CRI lights before. So with all this in mind, I have a couple questions.
#1: 82 vs 96 CRI - is the CRI bump alone worth accepting a 33% decrease in lumen output from 12k to 8k?
#2: Even in a cave environment with no natural light, am I overestimating the importance of lumen output? For example - is 3-4k lumens enough, and 12k lumens would never really be useful anyway?
#3: If CRI of 82 IS good enough that the CRI version isn't really necessary, AND I am overestimating the importance of lumen output here, am I better off just getting the 4x lights at a significantly decreased cost?
Thanks for your input!