Well if one of the four dies is less efficient you geht less light for the same current.
Maybe it was on the edge off the spec when Cree selected the four dies?
Well, it is sure not nice, but dead on arrival?
Versuch mal die LED direkt zu fotografieren, unterbelichtet und mit nem ND-Filter
Very strange indeed, this is also the first I have heard of any major issues with any GT so far. Everything else have been minor things.
Like they said, it is very strange that 1 die would burn out while the rest still work. Can you get a picture of the LED itself? Maybe on moon mode as well.
It is hard to make any good picture with my Nokia 808 PureView Cellphone. But I made some.
I did not have an other camera, only a small old Exilim EX-H10, which makes worse pictures as my cellphone. It has only a small 12MP CCD-Sensor. My Cellphone-Sensor is 1/1,2” big CMOS with 38MP.
Last two pics with the same orientation. You can see the bonding wires.
That is definitely a faulty die in the LED.
I have had the same thing happen to other quad LED’s and the XHP35’s too, but only in Moon light level/mode, anything higher all 4 dies worked…
Try looking at it at higher power through a welding protection glass if it is powering up at higher level.
I see it in higher levels too. I can see the dark edge in the Hotspot, so no need for welding glass.
Bummer Man!
Noticed something else with your centering ring bar too…
All Centering rings in the production lights has this big hole. Only the prototypes had a good fitting centering ring.
That’s not true.
They were changed to the larger hole sometime after production started. It was discussed many pages back in the main GT thread.
Here’s a tip for removing the bezel. Loosen the upper head from the light engine section first, this takes pressure off the o-ring on the glass and makes the bezel much easier to turn due to less friction.
Why didn’t I think of that sooner. Duh. 
Jason is there some shots of the Gt in bits, as in the whole thing? I have seen the ones with the carriers all in bits, but the head is in 1 part. If there are some, may be useful to pin them to the 1st post for those of us yet to battle opening it. I’m sure I saw some in the depths of a thread….
I’m waiting for the new led’s before I’m even trying. I suppose they will be some months off yet? (I read Lumintop may do something ?)
I checked and I don’t really have any good shots of the head taken apart. I’ll work on finding some and add them to the main GT thread post #3 with the other pictures.
Does this help?
I added it to the GT thread.
I took my GT apart real quick and took a few pictures. Here you go.
.
/\\\ Nice pictures Jason!! Thank you……. :+1:
After seeing these it finally hit me what KB was saying about the LED centering spacer “floating” on/around the two MCPCB retaining screw heads.
Can someone add Maukkas pic with the test results
under FAQ - Emitter
, please?
Original posted here [PART 1] Official BLF GT Group Buy thread. Group buy officially closed! Lights shipping. - #18312 by maukka
Crosses arms and nods head like Genie.
Done.
Post #4, main GT thread.
Thank you so much Jason, you are a top guy! That will help dummies like me so much! :laughing:
Have a gold star for your work! or some sushi? 
