I like that variable frequency strobe. I would probably never use it but it'd be nice to have.
+1 on the stepdown. It would be nice if it was actually 600 lumens for 2.2 hours and not 600 lumens for 5 minutes and then maybe 400 lumens for 2 hours. I hate that.
First off, no - nowhere on the Klarus site does it mention a step-down. However, that is not a large enough head to make me think it could dissipate enough heat to sustain 600 lumens. There should be some kind of protection mechanism for overheating - either triggered by a timer or thermal sensor.
Second - runtimes are almost always given for the entire time it can sustain that output. I.e. if they say 2.2 hours at 600lms, then IF there is a step-down they will turn the light off and on again to maintain 600lms (allowing for a cooling period if necessary). So IF the step-down occurs after, say, 5 mins, then they will run it for 5 mins, turn it off, then back on and run it for another 5 mins, and so on until it dies (well, usually manufacturers stop timing at 50% of the output, i.e. 300lms in this case, though with a regulated circuit it's usually putting out the rated output until minutes before it quickly drops to zero).
My question - why do they list 16340s as a possibility, but then in the specs say it's "not recommended"? Under what circumstances would it be acceptable/not acceptable? I understand why they wouldn't, for example, recommend a 14500 instead of an AA due to overheating concerns but say it's "possible" in that it wouldn't fry it the second you turn it on. However, batteries labelled 16340s are usually pretty close, if not identical to CR123s are they not?
... batteries labelled 16340s are usually pretty close, if not identical to CR123s are they not?
Looks interesting. What do people generally think of Klarus as a brand? I haven't read too much about them on CPF.
From Klarus's website:
2. New circuit design delivers both high brightness and long runtime (full brightness is constant for 3 minutes, then the brightness will drop to 70% of full brightness)
600-420
I still want it.
The screw on filters look like a great idea....
So, there is a stepdown from 600lumens after 5 minutes afterall? I didn't read that anywhere but here.
I agree though I really don't like the stepdown either.
Keep the brightness constant until it dies. It says (600 Lumens 2.2 hours) that's what I would expect. They should give it the true 435 lumen rating is it. Sometimes I feel like these manufacturers play to may games. Like the JetBeam P10A. 650Lumens for 30 minutes and they never informed anyone lower modes wont work.
Sorry for the rant guys.
From Klarus's website:
2. New circuit design delivers both high brightness and long runtime (full brightness is constant for 3 minutes, then the brightness will drop to 70% of full brightness)
600-420
I still want it.
The screw on filters look like a great idea....