xml2 announced!!!!

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f42
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XM-L:


Source: Cree.com

Source: flashlightwiki.com

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XM-L2:


Source: Cree.com

Source: flashlightwiki.com


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Bort
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When comparing the data sheets i noticed the xm-l forward voltage graph is at 25ºC and the xm-l2 voltage is at 85ºC
What effect does higher temp have on forward voltage?

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ChiggerPepi
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So it appears to be that an XM-L2 is basically 2 bins higher rated than the standard XM-L

So an XM-L U3 = XM-L2 T6 … More or less.

ChiggerPepi
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One more way to look at it:

Since the highest rated bin currently listed for XM-L2 is a U2, then basically we just got an XM-L U4, wish a little different markings and appearance.

RedSpawn
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I compared the datasheets and the new XM-L2 seem to have marginally lower output?
679 vs 692 for a T6 at 2A

but lower Uf is nice!

edit: ok, i just realised the XM-L2 is at 85° vs 25° Wink

djozz
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if the xml2 behaves like the xpg2, it is not only a few bins brighter, but can also be driven harder before output is levelling off (so where did they offer the 10xamc7135 driver again Wink).

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ChiggerPepi wrote:
One more way to look at it:

Since the highest rated bin currently listed for XM-L2 is a U2, then basically we just got an XM-L U4, wish a little different markings and appearance.

which might be the BEST part – no more BS’ing by claiming U3 but producing T6 output…(not that it has happened to me…)

edit:well, not entirely – they can still BS xml2 bins….but we’ll know for sure it isn’t xml…

Jerrycobra
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wow its a good thing I did not buy too many XML lights recently, me want haha.

I wonder how long till a p60 dropin? or someone like crelant will adopt them

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Wow. And “they” said it couldn’t be done…..

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Slim Pickens
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No solder pads on the topside Sad

The lower forward voltage is great news, although that may be a result of being binned at 85C (higher temps result in lower Vf).

RedSpawn
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I just thought of something:
When the Uf is lower and we drive them with a linear regulator (AMC7135) we would in fact have more voltage burned off by the regulator.
Therefore the driver will get hotter…..

am i making a mistake?

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Unfortunately not.

I think it’s time for BLF community to make our own
(buck) driver design that will be more efficient than linear 7135 based drivers. Most of serious users are by now familiar with soldering iron and have AVR programmer so this should be a decent base for further diy projects.

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RedForest UK
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But then the LED itself is converting 20% more energy into light, so that will get less hot Smile

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Who do you think will carry the new XML2 bare or with round base first? Hope I can get the highest bin in a nice tint like the 2B

I wonder if this is the reason Thrunite was blowing away the TN31 inventory…Hmmm

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The change from 25C to 85C represents a more realistic approach to binning. Having said that… Crap, crap, double crap. I still haven’t finished my previous XML mods.

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Mmm...xml2's....

Yes, I will have some of these as soon as they're available and will run a full test.  

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Love it! having no current spreaders will look nicer in aspheric.Cree is notorious for releasing higher bins later down the road,so I might wait for the better binned stuff to surface.Other companies are really floundering wirh their new stuff,especially SSC with their z series...fail.I'd like a few to play around with,even if they are lower bin first thing I would do is throw some in my outside security light.

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RedForest UK wrote:
But then the LED itself is converting 20% more energy into light, so that will get less hot Smile

i think it’s 20% more from about 20% efficiency —> 5% more energy into light Wink

chiefinspectorfinch wrote:
I think it’s time for BLF community to make our own (buck) driver design

since every new generation of cree leds seems to have a lower Uf this could be an interesting idea.
I’m going to read up on buck converters, i never liked the idea of burning off excess voltage in linear regulators.

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Good move by CREE to recapture the miniscule Nichia 219 market

 


Ford Prefect
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Been lazy about ordering a U3 on copper to pop in my HD2010, and it pays off!

Will be looking for the XML2 in high bin on copper now! Direct drive off a freshly charged king kong with a big jump in surface brightness, this should throw nicely.

ryansoh3
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Ford Prefect wrote:
Been lazy about ordering a U3 on copper to pop in my HD2010, and it pays off!

Will be looking for the XML2 in high bin on copper now! Direct drive off a freshly charged king kong with a big jump in surface brightness, this should throw nicely.

Awesome! Did you order it from led-tech or IO?

Cheers!

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Slewflash
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This is awesome

Slewflash 

flashlight man
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Top notch information! Cant wait to see them in action.

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80 CRI minimum in T4 bin at 4000K, looks and sounds sexy to me. T4 bin XM-L2 should compare nicely to T6 bin XM-L.

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I wants one Wink or 5

I’m glad I’m not the only flashlight collector out there, I was beginning to think I was strange.
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ryansoh3 wrote:

Awesome! Did you order it from led-tech or IO?

Cheers!

I was going to order from led-tech, but will be waiting for the XML2 on copper to be released after this news!

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Is this a “real-world’ 20% increase in light output with an optimized reflector and driver? Or will it be realistically more or less?

For example, with the correct driver, let’s say a Fancy Fandy hoo-fire ke-hd-2010-5-897 now puts out 875 lumens with a T6. With an optimized driver and reflector, the comparable light with an xm-l2 will now put out 1050 lumens?

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Lower Vf will definitely help the regulation in multi cell lights those can work with a single 18650, like Thrunite TN10-12

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Ford Prefect wrote:
ryansoh3 wrote:

Awesome! Did you order it from led-tech or IO?

Cheers!

I was going to order from led-tech, but will be waiting for the XML2 on copper to be released after this news!

Whoops, misread your post. Sorry about that. Smile

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Some german guy made some calculations.. vF actually got higher by about 46-76mV.

http://www.taschenlampen-forum.de/taschenlampen-neuigkeiten/20304-cree-x...

Basically vF decreases while temperature increases. As vF is now also rated at 85°C, its higher.

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