Results: Testing XM-L, MC-E, SST-50, and XP-G emitters **Updated**

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garrybunk
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Thanks for the offer Erik!  I am definitely keeping you in mind for a custom P60 drop-in or even just a custom programmed driver (think I'd like Medium a bit higher than the usual 30%, or even 4 brightness modes) for another mod. 

100 minutes vs. 70 minutes sounds considerable (for my application), so therefore I don't see the gain of 50 lumens worth the 30 minute trade-off. 

-Garry

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sixty545
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Don't want to be a spoilsport but please remember that Match's curves are only valid for a heavily cooled emitter. The top points for the curves in real life lies at a much lower amperage because of the generated heat .

[EDIT]: Calculations using Cree's derating curves give me for a "normally" cooled flashligt a top on the curve at an LED output of:

370-400 lumen @ 1.8A for XP-G R5 and

730-780 lumen @ 3.5A for XM-L T6

but the top 30% of the current only add about 12-15% of light output.

OTL (out of the lens) output normally are about 80-85% of the LED output.

garrybunk
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Yet another reason for me to stay back to 1.4A / 1.5A!

-Garry

My Bike Lights Thread, Optics (TIR) Comparison Beamshots, Diffusion Techniques


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monchi
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Possibly the most informative post for us modders on this forum. I've actually photographed the charts to my phone for easy reference. 

Thanks Match!

benckie
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Budgeteer wrote:

I would really love to se an XP-E or XR-E q5 led in the mix. Smile I still like them.

yeah XR-E q5 Wink one day when time permitts

Lothar
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Can't a few of us donate $1 or $2 to Match so that he can test a XR-E Q5 and R2? (I'd be willing Laughing)

JohnnyMac
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Lothar wrote:

Can't a few of us donate $1 or $2 to Match so that he can test a XR-E Q5 and R2? (I'd be willing Laughing)

I'm in if Match is willing to do it. I'd love to see what an XR-E can put out and what difference there is between an R2 and a Q5.
dthrckt
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don't worry guys, it is in the works (well, at least the R2) WinkSealed

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Jinx
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What about the newest Cree's, any plans, I realise they may not be power houses so maybe not much interested?

Match
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dthrckt wrote:

don't worry guys, it is in the works (well, at least the R2) WinkSealed

Yup.  Thanks to dthrckt graciously sending me an xr-e r2, it will soon be tested along with a direct to copper mounted xm-l.

Match
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Gentlemen,

  The initial star mounted test for the xr-e r2 is complete.  The first post has been updated to include the graph.  One of these days I'll go through and clean up that first post.

Thanks again to Dthrckt for sending me the emitter for testing....and yes, I'd like to someday get around to testing the new Cree flavors too...  I don't need the money, but if y'all could somehow paypal me "15 minutes" that would really help Smile

-NeedsavacationMatch

garrybunk
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Thanks Match! So it's not worth going over 2.0A. Guess you didn't test it to the point of "pop, burn, fizz, fizz". How was the heat generated at 2A? Manageable for a decent heatsink setup?

-Garry

My Bike Lights Thread, Optics (TIR) Comparison Beamshots, Diffusion Techniques


NOTE: Moving my photos from PhotoBucket to Flickr. PM me or post in the thread if you can’t see my images and need me to fix or send a gallery link. PhotoBucket images should remain visible until November 2018.
agedbriar
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Thank you Match!

Overdriven XR-E lights seem to be quite popular right now.

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Thank you (again Wink ) Match. Those last results show why xre are still all the rage in flashlights. And a super duper reference as always. 

~ Ledsmoke ~

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Match
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Thanks guys,  glad you can use the data.

garrybunk wrote:
Thanks Match! So it's not worth going over 2.0A. Guess you didn't test it to the point of "pop, burn, fizz, fizz". How was the heat generated at 2A? Manageable for a decent heatsink setup?

In a typical star mounted application, regardless of whether or not the led star is mounted on 3lbs of copper or not, the answer to you question is no...not worth going over 2a.  If it responds anything like the xm-l did, then the bottleneck is the star.  As soon as I get some time, I'll remove the xr-e and directly mount it to copper and retest. 

There was no reason to take the xr-e to failure, as the breakover point for output was 2.1a. More importantly, I want it alive for the afformentioned test. As for the heat, think of it in watts for easy comparison.  2a x @4v is about 8watts. Compare this to @ 9.5-10w for an average driven xm-l.  

dthrckt
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great work, Match!  this has got to be THE most useful thread in the 'flashlight web'

As for the XB-D and XT-E, Cutter doesn't have any 4 xb-d PCBs.  I suspect the one up versions of each will find some niche w/ beam profile or tint, and maybe eventually price, but I doubt we'll select them for throw or high output.  Still, the data will be useful when you do get around to it.

I, for one, will be much more excited about the direct copper mount results Smile  Still, you shouldn't feel pressured, that would take the fun out of it, and if that happens, what's the point!

Match wrote:

Life's been rather hectic as of late...

I hear that!  I spend so much time fixing and maintaining my 'stuff' (particularly IC engines and whatever they're bolted to) that I don't feel like I own it - it owns me!

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apt323
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Thank you for all this information.  This is my one of my favorite threads I have ever read and like the updates.

 

Thank you! Crown H)

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Thanks for all the effort, Match! Much appeciated. Beer

warmurf
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Hi,

 

It's already been asked a couple fo times and I can't see a reply, but are you/would you consider testing a SST-90?  The interest is huge because so many of the Chinese lights are under driven at 5-6As, where as the quailty units (Olight, VP2000, custom builds) hit out at 9-10 amps plus.  It would be interesting though to see just how much difference it makes between the levels regarding lumens output.  I shy away from buying the cheaper lights due to the amount of drive but if there is really little between, then maybe there is little reason not to try them.

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I think he mentioned his power supply was maxed out w/ the sst-50 test

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Thank you very much Match for the XR-E R2 results!

Was it an EZ900 or EZ1000 emitter?

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I was inspired by Match's new guess-the-output contest...I plotted his XM-L test results along with Cree's data for T6 and U2 XM-Ls, accounting for thermal resistance.   It's not 100% perfect [I made assumptions here and there for lack of data] but I was happy with how close the simulated data mimics the real deal (see chart 3; chart 2 refuses to cooperate).  Data in bold font is overdriven territory-looks like Match got a high end T6!

https://docs.google.com/spreadsheet/pub?key=0AsTyaLKLOLAbdDlFUHktTGE1NE5qbkNEQVc5RnllMXc&output=html

 

 

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Slim Pickens wrote:

I was inspired by Match's new guess-the-output contest...I plotted his XM-L test results along with Cree's data for T6 and U2 XM-Ls, accounting for thermal resistance.   It's not 100% perfect [I made assumptions here and there for lack of data] but I was happy with how close the simulated data mimics the real deal (see chart 3; chart 2 refuses to cooperate).  Data in bold font is overdriven territory-looks like Match got a high end T6!

https://docs.google.com/spreadsheet/pub?key=0AsTyaLKLOLAbdDlFUHktTGE1NE5qbkNEQVc5RnllMXc&output=html

 

Very Nice!

benckie
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Not a diffrence the human eyethan pick up

Slim Pickens
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benckie wrote:

Not a diffrence the human eyethan pick up

agreed-I can *just* detect a difference in output comparing two of my Mags modded with T5 and T3 XM-Ls.  Even then, I can't really account for how their tints (3C and 5A-ish) affect that perceived difference.  Basically I had to find out if I could find out how well real life stacks up with Cree's data and vice-versa Wink

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Some of the images aren't visible, like XM-L and XP-G chart.

Can we have those back please?

This is my flashlight collection.

Match
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Not sure why they disappeared, but I just fixed it.

Bort
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What did you use to measure the lumens?

The Journal of Alternative Facts TM

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scaru
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He used a home made integrating sphere. 

http://budgetlightforum.com/node/2156

Bort
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scaru wrote:

He used a home made integrating sphere. 

http://budgetlightforum.com/node/2156


holy goddamn thats awesome Big Smile

The Journal of Alternative Facts TM

"It is critical that there is a credible academic source for the growing and important discipline of alternative facts. This field of study will just keep winning, and we knew that all the best people would want to be on board. There is a real risk in the world today that people might be getting their information about science from actual scientists"

 

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