No one tested this LED extensively yet, but i driven it at 12A and it worked alright, no signs of degradation nor any indication that it’s getting close to peak output. It should handle direct drive just like the 5050 and the 9090 does.
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Ohkk man.
But at 12A how much was the voltage because Vf increases at more than 8A. In order not to fry my LED. Please elaborate.
Somewhere between 3-4V probably
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Remember to wrap bacon on it because at 8 amps with one led you can cook. I am joking
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Seller mentioned that its 5100 lumens…is it so?.if driven at 12A?
Maybe that’s the peak output of this LED measured without optics. Drive current is unknown, but it’s for sure higher than 12A. The XHP50.2 (3V version) peaks at just over 5000 lumens at 22A, so, if the unknown manufacturer of this LED (sanan? getian? lumenpioneer? no one knows for sure) somehow matched the efficiency of Cree LEDs, which are king on this regard, we are talking about at least 22A.
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22 A for burn the bacon
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These Chinese LEDs are not as efficient as their name-brand counterparts, but are getting better. The new 4 die 5050 LEDs in the NS14R do pretty good.
The drive current for these 5050 round die LEDs depends on the LED, but you’ll max out around 7 amps for the smaller one 5050, and probably 10 amps for the 707 size one.
Purely speculative, and idk if anyone has actually determined this yet or not, but I have a feeling that the L70 round has a pretty high Vf, because when driving it with convoys unregulated FET driver I didn’t see much, if any, noticable difference in output compared to when I was using the 6A linear driver. I don’t think I was actually getting 12A by direct driving it. I think Vf was probably near 4V by like 8-10A and you can’t really drive it too much higher with 1 cell. Just speculating though. I feel like you could probably go higher but you’d need some kind of boost driver maybe to like 4.5V
The L90 hi on the other hand has super low Vf because using the same FET driver with that emitter was pulling enough current to flatten the springs after a couple minutes of use. So I replaced and bypassed the springs with a little copper braid but it cooked that too and it frayed apart so I’m back to the drawing board. I’m also noticing the phosphor is starting to degrade and the thermal vias are getting darker on it. This led would do good with a buck driver made for an sbt90. The bond wires havent broken yet though, and my version only has 4 of them. I do have it in a zoomie though, do the thermals could be better.
The L70 pulls exactly 12A in my Jaxman Z1 (26650)
so the Vf can’t be very high
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Hm, maybe the returns between 6A and 12A just aren’t that high then. Maybe I’ll put on 10 pairs of sunglasses and see if I can measure Vf at full power and not go blind 
There’s also a ton of variation between this emitters. I cant find the page now, but a few nights ago I was looking through some Chinese wholesale LED listings and I found a seller that had at least a 1 or 2 dozen different versions of these round yindings for sale, and they appeared to have been made by several different manufacturers. Some had a bigger LES, some had darker thermal vias, or completely different solder pads and they all had different power ratings. So I think what we call a yinding 5050 or an L70 hi might actually be a dozen different emitters by a bunch of manufactures. Which if true does makes comparing them tricky.
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What is happening with this LED is imo very similar to what happened with the first gen XM-L and XP-G clones. Someone made very similar (to the OG Cree LEDs) dies, but very cheaply, and started making any sort of LED with these, and they flooded the market, and it’s happening again with these round LEDs, someone is making the dies (getian and/or sanan i suppose) and them and other manufacturers are assembling these dies in various packages (but not in 3535, unfortunately), and they are flooding the market with these things. That makes comparing them very tricky, as you stated.
If these LEDs weren’t this green, and available in 3535, they would’ve been even more popular, they do look very nice under TIR optics (perfectly round hotspot), and they do perform quite nicely for how cheap they are, despite being more on the inefficient side.
If you are interested on these things, the Yinding store have a 7060 version with a small L50 sized die and a big, close to L70 and L90 size die, which performed way better than the L70 in terms of intensity and better than the L90 in terms of color, and it has 8 bond wires instead of only four.
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