It's cool that the TK61 will be TK75 extender compatible.
Am I the only one kind of jaded by the "burst" mode being a thing on all lights now? Even the "upgrade" model to the E25 seemingly has a lower high mode and a burst mode as the highest mode. I'd much rather have 187 lumens with no step down after 3 minutes or whatever. I think burst is cool on some of the really small lights and maybe some of the really big lights if it allows a HUGE jump in lumens, but not for a mid range light. I've had the original 187 E25 next to a 258 lumen TK11 and there is not that much difference outdoors in brightness. Granted the E25 probably has a slightly tighter beam but still.
I hate that so many companies are playing the lumen game hardcore and not in a good way. Find a balance in brightness that doesn't compromise sensible run time or cause step-down. I hope this isn't a trend more and more if high power led lights start to become more mainstream (than they are now). Most people still aren't even willing to buy a 35 dollar E21 these days. They don't know better.
Aside from that gripe there is a lot of cool new stuff here though. Those bike lights with integrated battery compartments are SWEET! I just bought the fenix bike light mount to use with my TK11, but I kind of want one of the new bike lights now too... for the other side of the handlebar
edit: Oh and another thing... why is nobody willing to define "burst" mode. Unless it's actively thermally regulated to step down after a certain brightness it most definitely has a time limit. It's total bull to list the run time of burst mode as: "/" 100 lumens 10 hours, 400 lumens 3 hours, 1000 lumens /
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