I don't know what kind of LED they upgraded the Kroma with but the efficiency on this new Kroma is quite outstanding. I was curious to see how it would run on a single IMR 16340 (with dummy cell).
Not only does it output the full 130 lumens, but after 1 hour of constant on, the light was still going strong. I stopped the test there. Not sure how much longer it would have ran, but I'm impressed.
I also noticed that there is not nearly as much heat with the new model. My old Kroma used to get really hot when constant on, not this one.