XP-L vs XM-L2 OTF Tests

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:

Billy, maybe 6 more cans of Pelforth blonde will enlighten you and then you can share with us the final results of your query…

But first…. answer this riddle

If you spell coast C*O*A*S*T
and you spell boast B*O*A*S*T
What do you put in the toaster?

I figured it out! I figured it out! I’m so proud of myself… :bigsmile:
If a blue house has blue bricks, and a red house has red bricks, what color bricks does a green house have? :wink:

I suppose almost any colored brick could be used to smash the glass of a greenhouse…

:bigsmile:

…or the Cree measurement error in binning. One the datasheet they state “Cree maintains a tolerance of ±7% on flux and power measurements.” That’s an error in binning basically the size of a one bin step. Even before any errors produced in testing by an end user that nominal T6 could be putting out low T5 or high U2 output when it shipped.

"Cree maintains a tolerance of ±7% on flux and power measurements." - this is so CYA all the way. If you were CREE and dominant a market as they do, you can get away with pretty much anything. This reminds me of our touch screen vendor at work. Get the things out in the field for a few months, and customers have to touch the displays harder and harder. Send back a bunch of returned pieces to the vendor for testing, and they say all are within spec -- duh, the spec's tolerance is so big, it's useless! So, field service tells the customer to roll your finger - make contact with the finger nail and it works fine... This is not a solution, so aggravating...

Lumens XM-L/XP-L
1 amp 1.5 amp 2 amp
T5 357 502 631
T6 385 541 679
V3 404 566 708
U2 412 580 728
V4 423 593 742
U3 439 617 777
V5 443 620 776
V6 462 645 809

All data recalculated from Cree XM-L2 and XP-L data sheets.Minimum lumens from CW with 85°c junction temp and Cree 7% + or - tolerance.T and U bin are XM-L2,V bin are XP-L.

The XP-L V3 bin sits between XM-L2 T6 and U2.The U3 and V5 bin are effectively the same.

The V6 bin is ahead on it's own,one bin higher than the highest,and still rare,XM-L2 U2 bin.

What's not to shout about,it's the new highest bin emitter from Cree.

I'm still practicing formats,sorry it is not easier on the eye.

Billy X, I already posted the images from PCT.CREE.COM for comparing the same current on XP-L V6 vs XM-L2 U3, XP-L V5 vs XM-L2 U2, XP-L V4 vs XM-L2 T6 all at 25C, check the previous pages on this thread.