great work djozz!
and all collected at one place its even more impressive…
The 219B-V1 I have been using have a nice low Vf. Had a triple hooked up to a 105C 8*0,35+6*0,38 and guess what: Even with my very long and thin dmm probes I got 5.08A!!! I wouldn’t try these with a FET-driver, not even a triple, way too much amps, too much heat generated. A member of the german forum fried a triple with a FET-driver, got over 16A initially.
Outstanding work djozz! Keep it going please, very appreciated.
That is a nice thing to look forward to. I was indeed planning using a FET-driver, but in a 18350 host, so that may just be perfect . 
Subscribed.
Thank you very much Djozz.
I made some X6 triples lately and wrote a build thread in german and I compared different emitters under all different kinds of CUTE-3-SS optics. I’m afraid you won’t see the images from the build and optics comparison without beeing logged-in, but: I think the beamshots should be visable to everyone. There are two X6 triples with B-V1 and some more lights, have a look if you’re interested.
Thanks for your work Djozz.
djozz, thanks for consolidating all your invaluable work!
CityCoffee, I was planning on running the 219B V1 @~2.5A but you say that’s too much heat. Was it more heat than the XML it replaced? From djozz test of the previous 219B I thought it would be fine but I guess I might have to run it slightly lower.
Thanks for all you hard work. This is an awesome resource. Your skills are very much appreciated!
Regarding the temperature @2.4A I made this remark just based on memory. Also, some driver behave differently according to the emitter vf. (I cannot guaranty you that my V1 is driven at 2.4A)
2.4A was measured by another user with factory XML emitter. On my side, the tail cap measurement on burst mode cannot be done with my tester at all (?)
According to djozz, the V1 is between the 219B and the 219C… The question is:
How close to 219C 
djozz chart shows some very good performance from the latest version and seems to be indestructible. On the other side, the 219B is far behind…
I believe that the 219B V1 can be used (for momentary period) around 2.5A without issue.
Without good test (djozz’s style) I would hesitate to associate a 219b-V1 to a 3-3.5A driver.
Apparently 219C is “very” fine at this current. (Nichia even set a max @ 1800mah vs 1500m for other 219b…)
Again, what would be nice is a 219C CRI90 sw45 or sw50.
Something very nice with the 219B-V1 is it’s neutral white characteristic. If you are used to warmer emitter, it may even looks too cool (especially with the sw50)
Other 4-5000k NW led do not make the red and yellow pop-up as the Nichia does. Finally, compared with a cool-white it makes the v1 looks off-white again. Weird but finally, it is what should be a true neutral white> no hue perception and a good color resolution.
I believe that some 3000k can provide a good CRI but with a strong orange hue.
Non high CRI neutral white (XML) need to be pushed to clear-up the greenish tint associate to them. Annoying…
Hope that someone manage to test more in details the V1… H)
Thanks djozz for putting all your great work in one thread!
Nice Collection
Could bot find the crashtest of xml and xpg in your List:
These measurements are always the first place I look to get an estimate of what’s possible and expected for anything light-related. Way more useful than the official specs.
Very helpful reviews.
By your chart for the xp-l vs xm-l about 950ma will produce 500 lumen and 3000ma will produce 1000 lumen. Suppose you take two of these leds wire them in series then the same for another pair. Now wire the two series pairs in parralel. The overall impeadence should be the same as a single led. Now drive this at 2000ma, to give each leg 1000ma. What would the voltage be? I assume 1/2 so the total voltage would have tobbe doubled.
Would you not now get 2000 lumen at only 2/3 the current for a single producing only 1000 lumen? as the wattage is i suared x r. Am I not now producing a lot more lumens for a lower power consumption. Or is there a flaw in my reasoning?
Well, a single highest-bin XM-L2 or XP-L will produce around 1200 (or more) lumens at 3000ma. Small difference from what you’re saying, but anyway. The biggest flaw in your math is that you’re failing to double the voltage for two emitters in series. So, in reality, the difference from four emitters connected 2S2P compared to one emitter is:
XM-L2 4X = ~2000lm from 6.04V x 2.0A for ~165 lm/w
XM-L2 1X = ~1200lm from 3.43V x 3.0A for ~116 lm/w
XP-L 4X = ~2085lm from 6.12V x 2.0A for ~170 lm/w
XP-L 1X= ~1250lm from 3.46V x 3.0A for ~120 lm/w
(These are rough calculations based on ratings in Cree PCT)
Still a good bit more efficient, but at the cost of 4X the emitters and double the voltage.
Edit: Just a quick addendum. If this math is correct, you would be using (a little less than) 4/3 the total wattage and getting 5/3 the total output when using 4X the emitters.
great info here, thank you djozz . losses on aspherics is very interesting for me. aware by the fact of loses of light, i like to build double aspherical systems almost always. its nice to have an big spot in a zoomie with an performance as high as 70% of total light output or even more. i wish i could have a big sphere sometime to measure my light.
Thanks you very much djozz for your invaluable contribution to our community.
A video of djozz reflowing mutiple leds on a single MCPCB
This is a good question…I’m trying to decide between the 219C 5000k and the XP-L 4000k V2. The 219C seems to still have the higher CRI (83 vs 75) but it might be negligible. The 4000k’s tint is quite nice but I’m not really sure which one is more efficient or has more overall output.
The XP-L HI likely has higher output and better throw. But do you prefer 4000K or 5000K? Have you compared the two color temperatures in person?
Me, I don’t like 4000K. It looks yellow to me, even at 93CRI. Many people really like it though.