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 
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.
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…
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
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
FYI, a few weeks ago I checked LG HC35C1 led (=a few years old, the newest gen. is HC35C4, impossible to obtain for me) for hot dedoming and in petrol, in both methods the dome would not come off in one piece and bits of silicon remained over the die. The phosfor was pretty solid though, it allowed scraping off remaining bits of silicon with a toothpick,but not all, tiny bits were left on the die.
Any luck, Mitko?
Getting ready to build a new batch of lights and wish I could get my hands on some of the original XP-G2’s or something similar. If not, I might have to just use the XP-L HI.
Well by default its something like S2, havent tested it in details with the dome on, it is capable of maitaining 4.5amps ( with a single battery and a fet dd driver), dedomes pretty clean though.
unfortunately when dedomed it performance drops dramaticly, its like 40% weaker than those upgraded new S4 emitters( 145kmcds vs 100kcds in a C8 host)…excuse me, but even a dedomed XPE2 performs better
It has a potential, i am pretty sure Samsung will develope those in future but for now those aint suitable for out throwing needs
Better not, try dedomed V6 instead, it outperforms any HI by 25-30%, or even a dedomed U3
Just curious, have you noticed real-world difference in your builds? I understand that V6 should out-perform the current highest binned HI’s (V2 or V3?), but dedoming is going to reduce overall output of the V6, no?
After reading through this thread, I came away with the impression that there’s no real advantage to dedoming a XP-L (as opposed to using a XP-L HI)