All profit baby! That stuff costs 0.01¢ per light…
haha! My wife thinks I'm mr. know it all when it comes to construction, but I'll admit I'm pretty good in that area.
I orderd my E07's glued so I'm not going to know if thermal paste was applied or not. Would the XPL-Hi 5000k and 6500k turn blue also if there was none on there too? Trying to get an idea of tell tale signs just in case.
I played around with the screw and optic hole locations in Photoshop. If there’s a template then just rotating it doesn’t seem to let one of the screws end up in a leg hole. It actually requires that the template be flipped over and then rotated. Then a screw can end up in either of the leg holes beside the wires.
If there’s no “This side face up” on the pattern and whoever’s responsible for tapping and threading holes is just tossing the template into the light arbitrarily then maybe 50% of lights will get screws in the wrong place. That’s not particularly reassuring.
Maybe not, there are the 3 screws holding the board tight against the emitter shelf, so as long as the MCPCB fits properly into the head then the screws can snug it down for good contact. Thermal paste would certainly help, but the copper is thick and rather large so maybe it’s not so horribly bad.
There is some sort of very thin almost oily residue on the emitter shelf in mine, and a grey substance around the edges… almost like some thermal compound had been applied but wiped off. The copper board shows quite clearly that nothing contacted it on the vast majority of it’s surface, but some of that grey is around the very edges… don’t know what happened to this particular light but it would appear it was disassembled and reassembled improperly. That would be my guess anyway.
Would the driver maybe be glued in with thermal adhesive?
Just ordered mine btw. I want to do the emitter swap that DB Custom did. It looks awesome. Not green at all. Awesome output. Hope it wont explode or catch fire.
P.S.: Why does it even work? I heard that due to the high forward voltage the LH would not be able to hold output for long. And I don’t even know what the forward voltage exactly is anf how everything plays together. Source1 Source2 (especially confused about this and the Amps each light would draw and the output produced).
rennet, I’m not saying the template was rotated, I’m saying the template was laid out wrong and not indexed. One of the three holes is not in the correct position.
Yes I know. I’m just adding that I think it’s because the template gets put in face down.
Kanton, I’ve used 50 LH351D emitters, haven’t had a problem with the Vf in any of the lights I’ve installed them in. Yes, FIFTY! Well, Fifty-Seven now. 
I think they just glue the bezel to the head. I'm not sure if I did the right thing ordering the glued version so I could get the warranty.
Not sure why your 5D is so greenish yellow. The 5D tinted lights I have are all much rosier than the SST-20 4000k.
OMG so it is true after all that they don’t use thermal paste.
If you are concerned you can use 90CRI LEDs and it would probably do ~7,000lm at a much lower vF
If you want the Vapcell 40T, why don’t you PM Vapcell_Dennis on BLF and he will steer you in the right direction. I have this cell and it measures 4,038mah and output on the E07 is just slightly less than the 30T. Excellent cell.
They really do, don’t they? I love how the LH351D emitters look, and they make a great beam in a lot of lights. The output is impressively even and consistent.
I just don’t like the beam under a 10507 optic.
It’s amazing how much difference that makes, no?
Thanks for mentioning that… so far the D4 with XPL-Hi V2-5D is the only light I have with “5D” tint. I thought it didn’t look nice (greenish-yellow, as you mentioned), so I didn’t try gettting that kind of tint anymore…)
I have an Astrolux S1 with XPL-HD “5A” tint and that light looks rosy…
It’s sort of off-topic here, but maybe someone can send me how a 5D tint is supposed to look like?
Hello Sir
Thanks for sharing the information.
Here is the story.
At first batch of ROT66, we used many paste under MCPCB, but still has some emitter-burnt issue. We inquired the paste suppier about it.
Then we got an answer from their technicians.
1. For thermal conductive rate: Flat surface metal > Paste >unflat surface metal. In reality metal surface are not 100% flat, so we need add thermal paste on the metal surface. They guide us that If the metal surface is flat enough, we should add a thin layer of paste on the metal surface to ensure the best thermal conductive.
2. The bottom of the MCPCB is very flat , The aluminum shelf is not 100% flat, So we added a thin layer of paste on the E07 head. We have done a lot of thermal test , no one led burnt at max turbo.
*For E07 SST20 / Nichia version , we only recommend max 20A battery , 20A battery can reach max power for E07 SST20/Nichia version. With a 30T battery on SST20 or Nichia the turbo will go blue no matter how much paste used.
30T battery is better used for E07 XPL version. *
Thanks
Jack
And we have done a lot of thermal test on stocked E07 , no emitter-burnt issue happened.
I wonder how much lumens the E07 would produce with Luxeon V’s in it 
Too bad that would most likely require a special board made by @led4power.
Yes, and DB Custom knows all this. He makes some of the brightest and hottest lights in the world.
However, what he found was not metal to metal contact. It was not metal to paste to metal. It was aluminum to paste to air to copper. This is even worse than having too much paste. There was an air gap between the copper piece and the aluminum, and it is important to make sure that gap is filled with paste instead of air.
It is true that the paste should be as thin as possible… but it should not be so thin that it leaves an air gap.
@FireFlies, I have a question.
My E07 makes a clicking sound sometimes…
First heard it after deactivating the Aux LEDs
Heard another click when I run turbo for a few seconds, then another one after ramping down
Heard another click while light was off and in standby and lying next to me.
Why is that? Why does it make a sound? Is something broken? I got the light today, like one hour ago.