XP-L vs XM-L2 OTF Tests

Surprised - now this I'm feel'n!! "Trust in Hank" - the only trustyworthy source on that side of the planet. Illumn, IOS, MtnE, Cutter - only ones I know of to trust bins and tints from.

Thanks Richard, you work very hard for us and it’s greatly appreciated!

Thes are the XP-L dyes - interesting because the early availability of "2A" match's well to the XP-L's.

I bought 10 XML-2 U3 2C tints from Cutter a while ago. I went back 2 weeks later and bought the last of their stock which was about 4. As far as I know they have not had any since. I have in the one light, its a triple, two of the XML-2 U3 2C and one XML-2 U2 2C and I think I can tell the leds apart shining the light on a wall up close with brightness but probably kidding myself. Heres three of the most scientific pictures l've ever taken with the light rotated each picture.

Looking at these shots you can pick it.

U2 is on top in the middle picture? (you should consider a carreer in science Steve, looking good! :bigsmile: )

how about mouser?

If you could get specific tint info from Mouser, yes. I know in the past all they had was the range grouping. DigiKey of course, as well - not sure if they carry much though.

The problem with Mouser & Digikey is that they're expensive compared to the other options. Even buying 500 LEDs they are still a little bit more expensive than what I charge for the bare LEDs! The only way to come out ahead is to buy 1,000.

Crash testing an xp-l will give us more information about their limits. Can it handle the current better than xm-l2?

No, they max out at about 7A, while the XM-L2 still gains output up to the point that they crash at ~8.5A

:_(

XM-L2's peak output is a little higher but at much higher current. What's with the fascination of pushing the maximum current possible? I'd rather have equivalent output at less current, thankyouverymuch.

How much more efficient is xp-l at 3+ curent?

Djozz's thread shows a pretty underwhelming XP-L V6 compared to what CREE says. Basically only 50lumens difference from XP-L V6 to XM-L2 T6 at 3A.
On PCT.CREE.COM they show a 177 lumen difference between XP-L V6 and XM-L2 T6 at 3A

Thinking of Djozz tests I would think theoretically V6 would only be identical to U2, but when I look at Pflexpro's test in this thread I see a V5 that is brighter than U2, more like in the line of what CREE says.

+1 HikeLite - these result are quite different. Not really sure what to make of it, but maybe the poor accuracy for cheap light meters to measure neutral light is an influence. djozz's were done on neutrals, while here (pflexpro) were done with cool whites. Also, djozz did the tests on the bare emitter while here they are done in an assembled light (more real world maybe?).

Also I've seen the U2 1D's under perform compared to U2 1A's, but who knows - could be because of the tint's effect with the cheap light meter I use as well. I betcha though the poor performance I've seen with 1D's had an influence on these test results.

I don't know either why the results differ, bare emitter or in a flashlight, differences between leds should come out equally well. I tested two XP-L V6 2A leds and they tested nearly the same.

Last week I did a test twice on XP-L U5 7A3 80CRI leds (from intl-outdoor, unfortunately I killed them both) and they put out 1650lm at 7.5A, while the 2A V6 puts out 2120lm at 7.5A . These results seem to match the bin-difference between the two XP-L's, I have no idea why the XP-L V6 tests similar to a XM-L2 T6 (2100lm@7.5A).

BTW, my XM-L2 bare led result is a bit higher than match's test 1.5 years ago (match:1740lm@6A, djozz:1920lm@6A), assuming that match used a T6-bin, he did not mention the bin. (our spheres use the same luxmeter (Ceto 1330B) so that can not be much of a source of error between us)

Later in the thread, match said U2 bin for his tests. He should have updated the OP - didn't though.

If you look at the binning and labeling of XM-L/XM-L2 you will see that for making a "good choice" with not tons of tints you got group E1 or E2 for cool whites, basically U2 E1 or U2 E2 so as far as CREE is concerned they sell you U2 brightness and for them E1 (1B, 1C, 1A, 1D), E2 (2B, 2C, 2A, 2D) or other tints (2T, 2R, 0C) fits the U2 brightness bin.
As we know the min. max. difference is about 6% from the least bright T6 to the most bright T6 (as an example). A much higher difference than that should be put on the lightmeter's accuracy levels, various temperature factors, etc.

I’ve been looking at the Cree spec sheets and come to some conclusions,while drinking 6 cans of Pelforth blonde(x% error :beer: )For the XP-L and XM-L2 emitters,the binning is the same,all at 85°c,T4 is 240-259 lm,T5 is 260 to 279lm,T6 is 280 to 299lm,U2 is 300 to319lm,U3 is 320 to 339lm…V6 is 480 to 499lm _but_the XM-L2’s are measured at 700mA and the XP-L’s at 1050mA,50% higher current.

The Cree data sheet for XM-L2’s give min lumen flux at 1,1.5 and 2 amps,the XP-L’s for 1.5,2 and 3 amps.Extrapolating the XP-L V4 from 440 lm min at 1050mA gives 420 lm min at 1000mA.The XM-L2 U2,at 1000mA, has 412 lm min.So XP-L V4=XM-L2 U2.The V5 has 460 lm min at 1050mA,438 lm at 1000mA,XM-L2 U3 has 439 lm min at 1000mA,data not there for U3 so assume same efficiency drop with current rise as U2.V5=U3.So what is a XP-L V6 equivalent?XM-L2 U4 or XM-L3 I want a V6 :bigsmile: