Part number is for the tighter grouping closest to the BBL but I’m unable to specify the bin. I have a 4000k sst-20 that’s slightly above BBL and don’t notice too bad of a tint shift. Fingers crossed for some slightly rosy ones.
Hi azhu, that are 2 good looking Frelux Energy1s 
How easy/difficult was the emitter swap?
About the SST-20 group buy: which specific bin where you eying?
I myself have a Kaidomain triple 3000K SST-20. And while CRI, R9 (deep reds) and beam uniformoty are great, personally I think tint of my SST-20s is on the yellow side, while I prefer rosy. Kaidomain states on their website they sell the J3 HD2 bin which should be below BBL, but to me doesn’t look like it. Djozz also mentioned something about tint of the SST-20 he tested.
Edit: seems more people are interested in the binning 
We are very spoilt by the tight bins of Cree leds that some sellers are offerring. Let’s hope for a good mix of tints with enough rosy ones.
I’m in for a couple if shipping from the US does not kill the price.
Thanks for trying this azhu!
I’m in for 13, but only if they are on or below BBL. How much does shipping to EU cost?
In that case you are not in, the 352 group that is what the OP is offering is a mix of 4 chromaticity bins (GA3, GD2, GC1 and GB4) of which two are under and two are above the BBL.
I wanted to do this groupbuy too, but with 3000-4000k LEDs instead.
The reason for this would be for the chance of tint mixing, getting the advantage of getting a beam that is always the BBL.
I might be interested in a few, depending on shipping cost to the UK.
Thanks azhu!
If it possible to ship via EMS (or may be some other way but not UPS/DHL/Fedex). I am in for 30pcs
I will commit to 10.
The emitter swap is super easy. Just remove the pill, desolder the wires, and reflow the old emitter out with the new. Then reassemble in reverse order.
As for binning, I don’t think I can choose the bin. I’m selecting the tighter binning group closest to the BBL line so there should be a good chance it will not have an ugly tint shift even if it’s slightly above the BBL line. I have the 4000k SST-20 and the bin was above the BBL line but the yellow isn’t super noticeable. Every batch will be different so I’m hoping to get some below the BBL line.
For international, prices usually vary between $10-15 USD for USPS First Class International Package. It’s $14 to Italy for example.
I post leds in a small bubble mailer as a plain letter, no tracking. From the Netherlands that is a one euro stamp. Does it work like that in the States too?
Yes I could do that too but it will be at the risk of the buyer should they choose to go that route. If it’s just for a couple LEDs, probably not a big risk but if ordering more, I’d recommend something with tracking.
I’m in for six.
Thanks for organizing this, 3500k is not a common CCT.
After using the Nichia sw35, I’ve come to really love this CCT, especially at night outdoors.
Thanks for organizing this. I would be in for 40 (not that I need that many) just to support this if you could pin down a tint bin. The 4000k sold on KD is the FB4 bin, which has some green. Even the FA3 bin used by Fireflies, which is supposed to be at or below the BBL was reported to have some green/yellow in it and requires a minus green filter to perfect. I think it would be safer to aim for GA1 and GD4 tint bin.
I love the 3000k sold at KD with HD2 tint. It is a bit yellowish at lower lumen modes but at higher outputs the tint definitely drops below the BBL for a neutral/rosy without yellow tint. It is not as rosy as the E21A 3000k though.
10pcs for me.
Mark me down for 12 please.
I have both 3k and 4k and seem to believe that 3500 may just be the sweet spot for these. 
Outside of Kaidomain they aren’t sold in individual bins, only the step binnings, the tightest bin available which is what this GB is for, will include GB4, GC1, GA3, GD2 tint bins. The SST-20 offers such excellent mix of CRI and great throw that it is hard to complain about even on the bins just above BBL.
I am in for 25.
I’m in for 10. Love 3500K, but so hard to find, thanks!