U4 exists and is sold here in individual quantities. 1A is a very cool white tint around 6500K and not what most people around here prefer. I have one of these, dedomed (which warms up the color temperature considerably) in a Fenix TK61.
I suppose if you’re chasing numbers, you should probably go for this. You might get another 30 lumens out of it. I don’t find chasing numbers you need instruments to detect all that entertaining anymore and would rather have something with good tint and color rendering.
I agree.
But this would mean go for the XP footprint (3535) in stead of the XM footprint (5050) so you can reflow a nichia 219C on it, or a XP-L2 V6 for that matter (preferably 3A or 3D tint) if you want high output.
I don’t want to sound judging, really, but it seems to me that you mixed up lumens and candelas…
Lumens are lumens, it’s a quantity of light…you can refocus as much as you want, 100 lumens will not jump to 200 lumens without feeding the LED with more current.
However, when you focus the light from 130 degrees to 80 degress, yes you are bumping the intensity of your beam, so candelas…
Good project for kickstarter, not for blf.
Seems that smb dont know the difference between lumen and lux. And also there are too many funny things in description:
In fact we see two cheap fr-4 xml boards with one 7135 based driver.
Test video
Iso 800, F 3.5. All flashlights are in equal conditions.
That’s a prototype. Serial units will be on aluminium pcbs. All pcbs on photos are our custom developments.
So your developers decided to make xml footprint board for switch :person_facepalming:
That’s a prototype! We didn’t want to order additional boards for a button if xml board suits it fine.
s. Are all Hohols are so angry? 
So at 800 mA XM-L2 U3 will produce about 350 lumens, correct? Not as impressive then, IMO. Still interesting
But then focused to a 80 degree almost uniform beam it’s still impressive (at least we think so) - look at video.
We can squeeze more lumens, but we want that flashlight to be usable. Not a one second toy.
Are you going to ignore my remark about lumen and lux/candela ?
[quote=X3]
[quote=ProjectOne]
You’re right. Maybe we’ve used term ‘Lumen’ incorrectly. We’ll study that.
Come on…really??
Not really? Which 5mm leds are more expensive and powerful? Or I need to add words: single chip led?
The XM-L2 U3 is pretty expensive and among the most powerful leds in 5050 size, so all is good with the description.
But for perspective, the Cree XP-L/XP-L2 (3535 size, so smaller) is just as powerful, Nichia 219C/319C comes close, and now there is the Luminus SST40 which also has about the same specs. The Cree XHP50/XHP50.2 will unusable for your purpose because it is a 6V led (quad die), but strictly spoken it is a (way) more powerful 5050-size led than the XM-L2.
Btw, it looks like a nice key chain light, and a bit brighter than comparable lights that are on the market (the several nice DQG key chain lights).
I could be wrong but I think this kind of discharge is too much for a 10180, unless it’s an IMR and I am not aware of IMR in this size. Your circuit also needs a cut-off around 3v because the cell will be over-discharged and will die after a full discharge. Does the circuit monitors the voltage ?
Yes, it’s too much. And it will have only 50% of capacitance after 20 cycles of disharge at 800 ma.
But we can’t avoid that if we have a task to build keychain flashlight with such brightness.
We have a cut-off at 3.2V
Is not a xhp50 or 50.2 a more expensive 5mm led?
Edit…
Ofc not for this projekt but its a 5mm led…