@Correllux, yeah, it’s actually a bit higher than the LH351D and close to the XP-L HD in terms of VF (looks about 3.05V at 1A).
Certainly not bad, but nothing like the monster low VFs we’ve had these recent times.
Very important though: these numbers are at 25C on a actively cooled desktop heatsink.
I’m not surprised their numbers are higher than all of the other manufacturers which test their VFs at 85C…
That means real world VF will be quite a bit lower.
Good point…I did notice that but it’s a head scratcher because they are stating ambient temperature, not junction or solder point, and there was no temp indication at all on the Vf/If graph. The voltage drop isn’t much, though…comparing the SST40 the difference between 25C and 85C is like 0.07V, less than a tenth. Dunno…let’s see how they do. I hope these will be nice in a couple of host projects I have in mind.
Also….curious. They have that LeiTeng logo on the ali and web site…and they are mentioned in the notes of the datasheet. Also mentioned in the datasheet is Kasin. As if those two names are manufacturers. I know borrowing and copying is the accepted standard but three names juggled about. Would the real company name please stand up? lol
So, talking with my contact, I’m realizing something.
Even the smaller/unknown LED manufacturers can produce perfectly fine LEDs and whatnot, it’s just that generic luminaire/lighting manufacturers often ask for the absolute cheapest LED prices, making for stuff that’s rather unsustainable in business.
That obsiouvly requires corners to be cut, and not caring much about QC. scinating to see that basically everyone can make good stuff if they’re actually paid enough.
It’s really interesting talking someone who’s actually concerned about this and telling me this directly, and honestly kind of refreshing.
I’m now waiting to get beamshots to see if we get a donut instead of a waffle design.
Edit: Good news! Donuts shouldn’t be an issue because of the design, which is very nice.
Update 1:
1. It’s been confirmed by the manufacturer, but donut holes are not officially not an issue:
“because of the no dome lens design, classical focusing holes are not an issue with this LED design.”
2. QC will not be an issue:
” We work with a lot movie industry customers which have very strict specifications like yours, so it is not an issue.”
In for 10pcs pls. Thanks.
I’ll take 10. Thanks.
10 for me, please :).
Finally something for my EYE10.
All added to the sheet.
Added to the list.
So what current can these be run at, and what output are you expecting?
4000-4500k is quite the range, I’d be more inclined to order some if they were closer to 4000k
Maybe. I’ll ask.
Personally, I prefer closer to 4500k, but I know some people prefer 4000k, so it gives us a range of stuff and perhaps in the middle.
What really matters to me is tint binning.
I’m on board with 4500K, too…wonderful temp when you can find it. I’m more of a 5000K guy usually but good 4000K is ok, brushing up against as warm as I like. 4500K is like HID crisp without being white-white or harsh.
Oh I agree! I’d prefer a nice 4500k over a green 4000k. But ultimately I’d love a slightly rosy 4000k!
Any idea on current handling and output?
Current handling should be at the absolute minimum on par with the XM-L2.
It’ll obviously be able to reach much higher power levels since it’s a flip chip design rather than having to deal with bond wires, so that’s nice at least.
If I were to extrapolate based on the 70CRI version, I’d say 1000-1100 lumens at 10W 85C, and slightly higher at the rated 25C.
For the 90CRI version, I’d say around 700-800 lumens at the same power, although we’ll have to wait until we get to manufacturing and testing to see what the manufacturer gets on their end, and then see what we get on our end.
I prefer 4000k but anything is better than the current 6500K for sft40 and sst40.
Yeah, and while I was tempted to get 5000-5500k, I think that was a bit much.
4000-4500k on the other hand is 
Actually tolerable general use CCT.
5000k is perfect for the day, but too cool for the night.
3500k is good for general evening use, but too warm for the day.
4500k is my own sweetspot.
I’m in for 10.
Added.
In for 20.
I will take 10 pcs, thank you.