The lower voltage configuration actually has a buck and a boost circuit - two separate circuits that kick in as needed. Buck is much more efficient than boost in general. In this case, 1.5v makes the boost circuit work much harder thus less efficient. The quarks are designed to use li-ions and be fully regulated - fairly rare in lights these days - most are just running direct drive, wasting lots of energy at the very beginning of a run.Anyone else notice how much the 14500 beats the Eneloop by in regards to runtime on high? I did the test here at home too and got 1h20mins on Eneloop and almost 3 hours on 14500. Unlike in max, they both are regulated to the same level so I'm not sure why 14500 is running twice as long since it should have comparable energy. Not that I'm complaining, it's almost making me consider reprogramming my Tactical to Low/High instead of Med/Max since I use 14500 most of the time.
I believe you are referring to the Tactical version? Sorry, but I was never sent one of those for review, hence why there is no comment. Preflash can exists on virtually all Fenix and 4Sevens lights, but I gather from comments here that the issue is indeed more noticeable in the two-memorized mode tactical setup. But I have no direct knowledge, not having tested the tactical version.This review was helpful, but I would have appreciated a comment on the preflash when changing from a bright memorized mode to a low memorized mode. I did not come across this comment until after my recent purchase of the light and now I am almost sorry I purchased it because for my needs the preflash defeats the purpose of having two memorized modes.
No, it isn't any brighter. The first sample I was sent was defective, and produced unusually high output and short runtime. The replacement sample (shown in the graphs and tables of the review) shows virtually no difference between 1x17670 and 2xRCR (i.e. 1-2%, which is well within measurement error).Can it be confirmed if the 123-2 is in fact brighter with a pair of AW RCR cells in it? I've looked at the graphs and it appears it is, but by the naked eye with my testing it isn't really any different.
I am almost sorry I purchased it because for my needs the preflash defeats the purpose
Is it possible to widen the flood? I don't care about throw.
I haven't seen the preflash in any of the LD10, LD20 or PD20 models that I have tested.Preflash can exists on virtually all Fenix and 4Sevens lights, but I gather from comments here that the issue is indeed more noticeable in the two-memorized mode tactical setup. But I have no direct knowledge, not having tested the tactical version.
The preflash issue first came to light around the time of the introduction of the Q5 emitter into the LxD, PxD series Fenix lights. By the time of the LDx0 and PDx0 refresh, the effect had been considerably reduced (although I'm not sure if it was totally eliminated).I haven't seen the preflash in any of the LD10, LD20 or PD20 models that I have tested.
Just got my Quark 123*2 Tactical yesterday. It's a fabulous little light. Everyone I've shown it to is absolutely amazed. I have primary setting (head tight) set to strobe and it kicks azz. Secondary setting (head loose) is medium steady-on.
I have noticed the 'pre-flash', but I don't care at all about that.
This thing is so small and lightweight, it just disappears in my pocket. It is a wonderful light for EDC.
$69 well spent. Good job Quark!
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