My UNI-T clamp meter usually reads too low, so I believe currents are closer to UI set values, which means peak is actually at ~5.7Amps, just like I measured.
What meter is it?
Have you compared it to a fluke?
If it’s a 210E then I would trust the clamp meter much more than the driver UI settings.
Yes, 210E. The thing is, I test every driver before shipping ,one of tests is current check (with Rigol DP811 PSU which has 0.1% current reading accuracy), for ex. 1.20A medium is in 1.17-1.22A range for 95% of drivers. Similar applies to other modes, but due to test connectors limitations I can check high mode for 3Amp driver versions.
Anyway, his numbers are pretty close to what I measured on bench test, peak is definitely higher than what djozz' test shows, and conclusion was that djozz' test rig has some additional thermal resistance which is not negligible, which causes lower peak outputs on higher power LEDs.
EDIT: just tested my 210E clamp meter with Rigol DP811 which confirms it's not that great for current measuring: at 5.00A CC set on PSU, it reads 4.88A, at 6.00A CC it reads 5.87A, at 7.00A CC it reads 6.82A!
Error is quite big, and zero-ing doesn't help at all since offset it is already +-0.01A during measurements.
Predictable and cancelled out if multiplying by ((5 ÷ 4.88) + (6 ÷ 5.87) + (7 ÷ 6.82)) ÷ 3 = 1.024376544492, O:) at least in your given case.
Cheers :-)
I also don’t see any issue using WF1mm with FET DD single 18650 setup.
As you said we just have to add more resistance like longer thinner wires, no spring bypass, low current batteries…
For example FET DD setup will work this way(with low current battery) 4.2V > 3.5V = 5.7A > 3.5A…
Proportional current drop happens when we turn on the light so no freaking chance of overcooking the led and very constant performance on lux meter to… :+1: Yes! Lux performance should not drastically drop… It will not drop even 10% from 5.7A-5A…
Since led has very constant performance we will not notice significant performance drop even up to 3.5V/3.5A of battery discharge, and even beyond that mark… FET DD cools itself naturally when performance starts dropping. So what is bad in that? 
So even with unregulated setup like WF1mm + FET DD can work just fine.
Now since I also use Uni-T clamp meter it seems that current measurement are bit lower than originally measured on UNI-T clamp meter but that does not changes anything… In fact… Even Better!
And then you go on describing the somewhat ambiguous solution to resolve the issues…
I mean, you choose to over drive the LED up to 5.5.Amperes on a freshly charged cell, which doesn’t even add output anymore.
Sorry, but i just don’t get it.
It’s not as if there are no proper CC drivers out there.
Nothing against proper CC drivers but nothing bad with FET DD either.
5.5A with constant and proportional current drop like in FET DD setup is not overdrive. It is just fine… So natural current drop with FET DD also means less temperature stress plus FET DD does not generate any heat on driver board while CC linear does generate?
Where can I get a 21 mm or 28 mm CC driver at 5.5 amps running decent e-switch firmware like NarsilM or Anduril with as low, or lower parasitic drain? I do really want to know because I can't keep up with all the goin's on.
I'm confused because since when is a 17 mm power switch driver the only one we need? Granted, it's the most popular but for my usage, it's still in the small minority of flashlights I have or am interested in.
I have (2) 2S 3v17mm 4-4.5amp Mtn. Max drivers and a 22mm 2S 3v 5.5amp Mtn.Max driver I’m looking for a Push Button Host(s) for…any Ideas?
Ooh nice! Awesome host. I wish it had the choice to choose small tube for single 21700 like the size of acebeam t27.
Yeah, you’re right.
Limited choice.
Not sure what Lexel has to offer though.
As for diameters, you could use an adaptor ring of some sorts.
Either way, i’m looking for e-switch 17mm FET CC drivers.
I don’t care too much for elaborate UI’s though.
3 modes usually suffices for me.
Wow, 995 available at only $9999…. I better place my order soon….
I mean those are nice drivers he mentioned. It wouldn’t be right to recommend something less than $9,999
Nice 2x21700’s hope they come out with it soon… robo…
Pic stolen from the Maxtoch site… by me…
Qlite 3.04A with added 3 7135 chips and biscotti fw.
Thanks!
I’ve built a C8+ with ld-A4 at 5A and white flat 1mm
I need to tune the centering ring heigh but at the moment I’m getting 211kcd nearly 920m
Is there any similar build? I’d like to compare them and also know how many cd should I expect
I will work on D1S and likely some other sizes CC FET drivers, but this will take 5-6 weeks at least to get to production if first design works out well