xml2 announced!!!!

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viffer750
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Kokopelli wrote:
Lower Vf will definitely help the regulation in multi cell lights those can work with a single 18650, like Thrunite TN10-12

Where do you see lower Vf?
Maybe I’m wrong, but when I calculate with the old xm-l’s “temperature coefficient of voltage” which is -2.1mV/°C , I get 3.224V Vf at 3A and 85°C.
3.35V + (-2.1mV/°C * 60°C)= 3.224V

this value for the new xm-l2 is 3.35V
And because of the lower “temperature coefficient of voltage” of the new xm-l2, which is -1.6mV/°C, higher core temp means automatically higher Vf.

unique engrish language... Smile

 

feilox
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xml 2.0 is out? At this rate I’ll wait for 4.0 by then the Chinese Lumens will be correct on all flashlights.

Don wrote:
It sounds like the XM LEDs won’t really be suitable for flashlight use. Pity…

RedForest UK
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RedSpawn wrote:
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

Yeah, I think it’s something like that.

Although I believe that lumen ratings are weighted according to the human eyes’ response to the wavelength/power spectrum of the source, so taking into account that these LEDs are white they should really be compared to the theoretical maximum for white light (around 250lm/w) instead of the theoretical maximum for monochromatic 555nm green (683lm/w), which gives a value of about 40% luminous efficacy, meaning nearly 10% less heat.

Anyway, I wanted to put a positive spin on it Wink

To be honest I don’t think the increase in heat from a linear driver will be more than that amount anyway. It’s only a small drop in vf, so it should about balance out heat wise.

inch
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Slim Pickens wrote:
No solder pads on the topside Sad

Wow yes, that sucks.
brted
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Ubehebe wrote:
Is this a “real-world’ 20% increase in light output with an optimized reflector and driver? Or will it be realistically more or less?

“Up to 20%” is what Cree says. I believe I saw someone say the 20% takes into account the variability in bins where you could have one LED at the bottom of the bin and another in the same bin, but at the top of its range. That gives you 7%, but that’s true of any two LED’s in the same bin. On CPF, Selfbuilt compared Foursevens XP-G lights against the newer XP-G2 lights where 20% is also thrown out and he said he wasn’t getting that much.

http://www.candlepowerforums.com/vb/showthread.php?344978

The Cree datasheet for the XM-L2 goes up to a U2 bin, but I don’t know if that will really be available. Because the LED’s are binned differently, what do you compare against? The two top bins: XM-L U3 vs. XM-L2 U2? Right now it seems like T6 and U2 are the most available XM-L bins. Once we know real-world bins for the XM-L2 and people start taking measurements, it will be easier to do comparisons.

dthrckt
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potem wrote:
Slim Pickens wrote:
No solder pads on the topside Sad
Wow yes, that sucks.

actually, it looks like the whole top side is two solder pads, which is AWESOME

JohnnyMac
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I will now have to upgrade a good many of my lights.  At least I don't plan on buying any more in the near future. Innocent

bibihang
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Now overdrive and de-dome it.

Manual Man
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Neat… now to wait 2 months while someone gets them in stock

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brted][quote=Ubehebe wrote:
The Cree datasheet for the XM-L2 goes up to a U2 bin, but I don’t know if that will really be available.

Yes it will!

http://www.digikey.com/product-detail/en/XMLBWT-02-0000-0000U2051/XMLBWT...

Price will be nice as well. XM-L2 U2 is basically XM-L U4, one word – WOW!

33696933
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I see Mouser has some in stock neutral white 5000k 75 cri T6 bin for 6.82

Tom E
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So, these can be ordered today from DigiKey or Mouser. Voltage is the same, mounting is the same, size is the same... Hhhmm - so, just order them and try mounting on a star? Not sure if the DigiKey U2 one can be equated to 1A/1B/1C, etc. Can that be determined from the CREE part # or that now obsolete for XM-L2's?

 Am I wrong here, is there something I'm missing? Not sure if anyone said the mounting dims are the same. From the diagram above, looks like the pads are the same layout, not sure of the dimensions...

Update: Crap, not in stock anywhere. Mouser has a min order of 151 or 250, something like that. Looks like DigiKey min order is 250 looks like -- that sucks...

33696933
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Tom E
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 Yep, been trying thru DigiKey - found a part# for T6's of Qty 1, but now it shows no stock for Qty 1 but has stock for Qty 250 -- the game is fixed!!

33696933
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Mouser has 193 of the t6 , 475 t2 and 250 t5

Tom E
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33696933 wrote:
Mouser has 193 of the t6 , 475 t2 and 250 t5

Yes! I see that now. So, basically you can get an XM-L2 T6 rated at the same brightness as an XML U3. Not sure how good this is, but looks like the T6 is a neutral color. Hhhmm. Are you ordering any? Anyone else? Will these really work on a stock XML star? I know the voltage is good, I think the LED (itself) size is good, not sure of the mounting dimensions.

Slim Pickens
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How the heck are you supposed to know what tint you’re paying for with Mouser, Digikey, Newark, etc?

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Slim Pickens wrote:
How the heck are you supposed to know what tint you're paying for with Mouser, Digikey, Newark, etc?

Not sure, but here: http://www.mouser.com/new/cree/cree-XML2/ they give you temp and CRI -- I think there is a way to determine 1A vs 3C, etc this way. Certainly the T6 for Mouser Mouser T6 is 5000K, so it's in the range of a 3C (http://flashlightwiki.com/File:Ansiwhite.jpg) but could be a 3A or 3D??

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20% is in reality still only 5% to the eye ..it won't wow you ..

  This is another conspiracy by Cree to make you buy another purple cw emitter.

seems to work

 

My opinion of the xpg2 nw 4c   is it's very very good compared to a nichia it's very close  to the same cri  maybe a bit pinker than the nchia but also much brighter ..2thumbs up on the xpg2 nw....4c

       καὶ τὸ φῶς ἐν τῇ σκοτίᾳ φαίνει καὶ ἡ σκοτία αὐτὸ οὐ κατέλαβεν

                            

       Dc-fix diffuser film  >…  http://budgetlightforum.com/node/42208

Tom E
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Boaz wrote:

20% is in reality still only 5% to the eye ..it won't wow you ..

  This is another conspiracy by Cree to make you buy another purple cw emitter.

seems to work

 Well, I don't think a 5000K tint will be purple... We are talking T6 neutral - meaning yellow/green. Tint snobs say purple, lumens snobs say yellow/green Smile.

 It's an XML T6 3C on steroids - increasing muscle mass by 20% ain't easy, getting 20% more horsepower (ex: 300 to 360 hp) in your car is gonna cost you some major bucks and a lot of work... Now if only I could lose 20% of my body weight... Ex: 220 lbs down to 176 lbs.

 

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chiefinspectorfinch wrote:
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.

But who could supply a new type of driver for us to fiddle with?
WWEFANS / rey?
Fasttech / Intl-O? Any ideas?

I think it should be done some way or the other…

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Im glad cnqualitygoods had to cancel my order for the 10 U3’s I ordered. The only problem is that I have several flashlights taken apart and awaiting their new XM-L’s. I bet we wait a good 3-6 months before the “2” becomes available outside of Cutter.

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FlashPilot wrote:
Im glad cnqualitygoods had to cancel my order for the 10 U3’s I ordered. The only problem is that I have several flashlights taken apart and awaiting their new XM-L’s. I bet we wait a good 3-6 months before the “2” becomes available outside of Cutter.

If you read this thread you’ll see that both Digikey and Mouser are already stocking the XML2…

I am currently extremely busy with work. Please do not expect a response from me quickly. I will be dropping in as time permits, but the amount of time I can dedicate to responding to topics and PMs is very limited.

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This sounds great. So can you tell me, does this mean the XML-2 has a higher output and also will use more power- in other words have a little less run time but just more output, or has the efficiency stayed the same or better??

Feel like holding off on new lights until these start showing up!

That Ninja Guy
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Same power, more output

EDIT
http://flashlightwiki.com/Cree#XM-L
XM-L2 chart is just below to compare

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From my experience with the XP-G2s, it seems like the domes come off much easier on the new SiC die emitters. Anyone share the same experience as I have?
I’ve accidentally de-domed three XP-G2s while reflowing the emitter and two emitters survived.

I wonder if this is the case with the XM-L2s as well…

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Just ordered Qty 3 of the T6's from Mouser:

 

Select
Product Detail
Customer Part #
Order Qty.
Price
(USD)
Ext.
(USD)
StatusDateInvoice #
 3$6.82$20.46
3 PendingPending-

 The details are sketchy on this. Does Mouser have the stock or the vendor, Cree, have the stock? If it's Cree, looks like 5 weeks estimated shipping. Tried calling Mouser but they are closed weekends of course. Hopefully can find out more Monday.

 These T6's are definitiely 5000K and 75 CRI, hoping they are"3C" equivalent or cooler - not sure how to tell or convert. I chose USPS Priority for $6.99, so total for Qty 3 is $27.45.

Update: reviewed the chromaticity chart (here) again, so for 5000K it should be 3A, 3B, 3C, or 3D. I'm thinking 3C because the only XM-L T6 Mouser carries is the same 5000K and 75 CRI.

 Anyone else try ordering these?

 
33696933
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I ordered 7 yesterday , they shipped it UPS 2 day

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warmurf wrote:
This sounds great. So can you tell me, does this mean the XML-2 has a higher output and also will use more power- in other words have a little less run time but just more output, or has the efficiency stayed the same or better??
You’re misunderstanding a bit how LEDs work.
A LED uses exactly as much power as driver feeds it with. No matter whether you grab 10A / 40W SST-90, 3A / 10W XM-L, or 3W / 1A XP-E, if you drive them with same constant-current driver, they all will use same amount of power.
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Shadowww wrote:
warmurf wrote:
This sounds great. So can you tell me, does this mean the XML-2 has a higher output and also will use more power- in other words have a little less run time but just more output, or has the efficiency stayed the same or better??
You're misunderstanding a bit how LEDs work. A LED uses exactly as much power as driver feeds it with. No matter whether you grab 10A / 40W SST-90, 3A / 10W XM-L, or 3W / 1A XP-E, if you drive them with same constant-current driver, they all will use same amount of power.

 To further clarify, the XM-L2 LED's should produce more output when driven by the same amount of power as an XM-L. This is their advantage - next generation, more lumens/per amp at the same voltage and same temperature, same package size. So, if the cost is the same and the bin,  tint, and beam pattern&color is all the same, and they actually do perform better as stated, they would replace XM-L. There are a lot of "if's" there though Smile and CREE doesn't have a stellar record with filling out the product family offerings, or filling them out quickly.

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