From the way they mention output and runtime for the high mode, it leads me to believe they are the first manufacturer I have seen to actually acknowledge that their light output steps down after startup.
I was going to say that it would be highly unlikely that you would find a light with a tritium tube in that price range, given the cost of tritium tubes these days, then Renegadethreads proves me wrong. Oh well, as long as I'm walking away with more knowledge that I came with, I'm a happy man.