Hhmm, guess I could have gotten lucky. Maybe the bare ones were remains from an old batch, or the new batch came in end of Jan, beginning of Feb. Sometimes he says the LED's are from a new batch or not, I've noticed. He's also very helpful when asked. I've asked couple of times for LED's bare that were not listed, and always were able to get them from him.
I should re-check tail amps then with my clamp meter - might be a little higher than 4.25A. I'm using 20 AWG wires and a FET+1 driver with the SIR800DP, springs bypassed with 22 AWG wires.
Okay… Good info on the number of dots. I guess I need to get my microscope out and check the few XP-G2s I have in my kit. I have a number of older emitters, but mine are all likely 1A tint.
I realised which of them where old or new , according to the size of the die (with help from li).
It’s pretty obvious if you learn what you are looking for.
I used a cheapo 10X pocket magnifier, along with my 2.00 drug store glasses to examine the dedomed LED, and that did the trick for these 58 year old eyes. I find magnification combined with a good light source really, really helps. My hands are still pretty steady. I work with a guy in hist late 60's and be does some super small incredible prototyping work still, but same thing - having the right tools is huge.
Mitko, those are the old style you are talking about?
Have more people tried the new style S4 2B? It seems like the main reason for the decreased performance of the new style is a higher Vf, causing less current to flow in a one cell setup. But the new style S4 2B that Richard tested actually had a lower Vf than the old style. Was that one just a fluke, or are there lots of new style emitters around that actually have a lower Vf and might still be good performers? I realize the new style also has a slightly larger die size, but not by very much.
The individual emitters sold out weeks ago. There are still some on stars but I don’t know if they are old or new. I plan on ordering a few to check but need to wait until I get paid in a couple of weeks.
Yeah thats true m8, yet refclector based torches have their atvantages, even if the target moves from the hotspot you still can spot it cause of the ” oreol, a.k.a halo” lighting caused by the reflector- and its very efective in open filed type hunting.
And ofc thet halo lighting “nukes” your scope eye if there are leafs, grass and other reflecting back obsicles…
By its another topic, and its hella long
Cutter still as S4 2C- its also a great emitter, same performance, same amps
I recently bought these S3 2B fom TaoBao. And have one of them changed into my Courui (DD) and found that it is actually brighter than the initial 2016’s S4 2B. However I still not sure whether these are old version.
They were produced in Dec 2014. Anyone know when CREE changed their production with new batches?
Yes, this is the old batch.
From the left to right: XP-G3 S5 2A (May 2016), XP-G2 S4 2B (Mar 2016) and XP-G2 S3 2B (Dec 2014).
(sorry for dirty LED doom surface as they are so small to handle with).
I just got a new style XP-G2 S4 2B from Richard. Tested it in an X6 with a fresh 30Q and got 4.05A and 52,700cd with dome on. Then I gas dedomed it and got 4.2A with a fresh 30Q and 98,800cd. The focus may not have been perfect when dedomed. With dome on the yellow phosphor filled the reflector at arm’s length. When dedomed the very outer part of the reflector was not filled with yellow. I think I might need to file the spacer down a bit, but I didn’t fiddle much with it. The tint seemed similar to the old S4 2B.
This performance is pretty close to the old style. Comparing to other peoples results, it seems like there is some variation in Vf for these. Maybe there is not much reason to be sad after all.
Also, I tested an XP-G3 S5 3A I got from Richard in the X6. With a fresh 30Q, I got 6.7A and 58,600cd, with dome.