It is strange that no one complained about the very short turbo run time in Power mode. After a few seconds, the lumens are reduced to less than half and certainly also the throw. The two Power and Eco modes are misleading. Practically the behavior of their turbo levels is the same! Just look at the reviewer's chart.
Much better is the behavior of the most recent BLF GT-90, with the same LED, whose turbo lasts at least 15 mins. and the performances are even higher than the K75. Look at the video review: https://www.youtube.com/watch?v=xQBDrNKyWKY