Cree changed production process for XP-G2 emitters!

I recieved few of the new die xp-g2 s4’s and instaled one in a B158 just to test the amps, turns out this thing pulls 4.5A with 30Q @ 4.17v. Im to lazy to dedome it now but with dome on my lux metter says 122kcd at 1m… I guess this thing wont hit more than 200kcd dedomed… huge dissapoitment.

Need to find good source for few s2 2b leds, i want to push my b158 to 290kcd again.

Your correct that is doesn’t state it outright…

I just said that it “looks like” has a larger die size…

With the current knowledge that the latest XP-G2’s seem to have larger die sizes (your own findings :slight_smile: ), and claim similar increases in Lumen/Watt, plus the wider viewing angle of the G3 (which admittedly might be a dome change) and the lower resistance and forward voltage, I would say current evidence suggests that they “look like” they will have larger die size…

We wont know for sure till we get some… And I intend to get some, just in case they are great…

Waiting for someone to stock them. :slight_smile:

I would really like someone send XP-G3 to Djozz for testing… Pretty please :slight_smile:

Dont throw too much hope in this m8, dont you see it has a XPE desing? The whole top is covered with a phosphorus: this automaticly means a bigger emitting angle, its clearly desinged for general lighting . Yet, we have to test it ofc…could be good enough

We all seen what they made from good old XP-G2 emitters (not just mentioned S4 2b from this thread, they messed them up in all bins) so can we expect something good from XP-G3?

Probably not…

I always thought that emitter throw performance should be improved in future by creation of new an innovative led emitters but the new trend is to make bigger phosphor layer emitters which will pump more lumens out of a dice… Pushing lumens and ignore lux performance?

Pushing lumens instead of lux? Maybe someone here may like it. But I am not one of them…

Any news Mark? I saw you active in Xp-G3 thread so I really hope you did not forgot on this thread.

I think there would be a lot of interest in old production type of XP-G2 S4 2B…

Oldest date possible. You can easy spot the difference between them.

And check those shipping to Europe.

Ordered all S3 bins from Mouser lately( K51, KE51, K51 and K53), they all came “improoved” ones…… definately not good for us:/

It would be great if an australian guy order some emitters from Cutter for evaluation, if they came out good we could arrange a group buy, at least the EU folks arround here, personaly i would buy at least 100 if they came one non improoved

I am also in for 100 of old production type of XP-G2 S4 2B!

P.S.

Mitko did you tried XP-G3 in well known host and how it act performance vise?

luminarium iaculator

Still waiting for the samples m8

About the S4 issue: Arrow Eurpoe has 5 bins S4 in stock( reets of 500pcs) - the problem is they dont offer samples from then, i cant even test …. one cant tell whats inside only from the part number( the production dates are 05-07 21015)

Can you tell them to take macro shot of just one emitter from that reel? Difference can be easily seen…

Good old G2 S4 2B

New production type xpg2s42b

I’ll take 50 or more…

That is 250 pcs so far… Hope Mark is reading this :slight_smile:

Hi luminarium,

All of the XPG2s I had up till now must have either been from the origonal type or I just didn’t notice the change. However I will throw my 2 cents in. This “upgrade” was not only done to XPG2s, but also to XML2s. Or at least “a” change was made. I never had any trouble with a change in tint, however the output from a single XML2 U4 bin dropped VERY significantly about 3 months ago due to a spike in the needed VF. I tested piles of LEDs from multiple sources to try and regain some ampers, but no luck.

I probly would not have even noticed accept I test custom builds like my shorty Maglites before they go out on a regular basis. Out of all the XML2s I have used since then I have found only one that tested out the way nearly all of the ones I got off RMMs first reel last year did.

I just hope when XML3 lands we recover some of that nice low VF as most of my builds use a mosfet driver. :slight_smile:

Vestureofblood,

Thanks for reporting. Your post goes in a first post of this thread as a warning that they probably changed production process for XML2’s

You are the man that works a lot with different emitters and especially mentioned XML2s and I worked with XP-G2 S4 2B exclusivity…

When differences are so big that we can actually visually spot it without lux meter and other stuff than we know something bad is happening there…

I hope Cree will make up for this mess with XPG3 or XML3 but if they will remain on new production process? I don’t know…

Did some testing today with one XP-G2 from FastTech (unknown bin) and with these three XP-G2 S2-1A’s from Kaidomain (http://www.kaidomain.com/Product/Details.S023026). Results are pretty disappointing, I was expecting much more, hoping that these leds from Kaidomain are from older batch. Testing was done with Samsung 30Q’s and Samsung 25R’s, both batteries delivered similar results. I wasn’t using any drivers, just direct drive trough 18 AWG wires. XP-G2 from FT is in my Brinyte 158 so I managed measured throw (194 kcd, 30 sec, 3,7m).

1. XP-G2 (cold tint, unknown, from FT) - Bat 4,21V, Max 3,10A, VF 3,90V
2. XP-G2 (1) (Kaidomain) - Bat 4,21V, Max 1,5A, VF 4,08V
3. XP-G2 (2) (Kaidomain) - Bat 4,21V, Max 3,76A, VF 3,82V
4. XP-G2 (3) (Kaidomain) - Bat 4,21V, Max 3,83A, VF3,80V

As you can see, results are all over the place with very high VF. For now I’ll wait for someone to test the new XP-G3 and make my decision on what to do with my Brinyte 158.

I see a rise in 2 cell hosts and buck drivers coming…

:frowning:

luminarium iaculator

There might be a hope in Samsung 3535 high binned emitters, i just got mu hands on some of those binned at 160lm per watt, and initial tests showed their cap could be removed easy :slight_smile:
Will check them asa i got home today

Please keep us updated… Fingers crossed…

Edit:
Maybe even LH351B?
http://www.samsung.com/global/business/led/lighting/component/high-power/lh351b

Samsung’s product rendering certainly looks interesting. Nice smooth die and no weak bond wires