No, it’s just one model, same for 70.2. The mcpcb is what determines whether it 6v or 12v.
The 50, 50.2, 70 and 70.2 have 5 pads under the base (middle pad is just for heat transfer) so the mcpcb can alter the wiring.
The 35 only has 3 pads on the bottom with the middle pad for heat transfer.
Exactly Jason.
That is what I meant.
Agro. I didn’t say that with a 2s2p setup the dies couldn’t be together. I said that
I can imagine that it would be almost impossible to design it so that the dies can be either in series (12v) or in 2s2p setup (6v) without increasing the gap.
If they choose to make 2 separate versions both dies can be as close together as they are now. But that would probably not be very cost efficient.
Thank you guys, I understand it now. 
Doesn’t seem like much progress in the XHP35.2 especially with the larger separation, which means possibly no XHP35.2 HI variant. I alwasy wonder what’s the purpose of the XHP35 HD when there are already XHP50.2 and XHP70.2 that are brighter and more efficient.
It’s physically smaller.
Yeah, it’s the biggest die with the most output using a 3.5mm pad. So if you have a street light full of xpl, it can be easily swapped to xhp35 and you get way more light from the same surface area. That’s how I understand it.
BTW, none of these leds are made for flashlights, they are more for street lights and commercial stuff.
I have a small 1x18650 Zebralight that uses the XHP50.2. I also have a larger 4x18650 light that uses the XHP70.2.
Those LEDs aren’t used much in budget lights, due to their 12v forward voltage (and thus requiring a boost driver or several cells in series), but they’re becoming popular for high-output flashlights.
The 50.2 and 70.2 are definitely used in budget flashlights. They can be 6v or 12v.
there is no problem in arranging the dies of the original XHP34 to make 6V but they did not make 2 versions, so there is only 12V
they would need to rotate some dies and do the bond wiring differently
2 bond wires in, 2 bond wires out like:
N N
P P
N N
P P
?
I think I understand what your saying.
The top of the die has both N
The bottom of the die has both P
Then they can stay tightly together and be 6v.
So they had 3 choices.
Make it 6v and tightly spaced
Make it 12v and tightly spaced
Make it able to do both, but have gaps.
Yes and they choose the most logical option. Only having a single option meaning single design and manufacturing process.
Especially for industrial use (or non-flashlight use) you’ll only need a 12v version.
They have updated the XP-G2 page and datasheet with the new HE version.
http://www.cree.com/led-components/products/xlamp-leds-discrete/xlamp-xp-g2
datasheet: http://www.cree.com/led-components/media/documents/XLampXPG2.pdf
Still nothing on the XHP35.2
Maybe it’s just me, but it looks incredibly hard to dedome.
There is XHP35.2 datasheet available:
New info:
Seems to me like a purely inferior product for our uses. 
I was looking for trower then stumble this. Its XHP 35.2 HI. I dont think or maybe if i miss, there isnt yet a light that use this version. Old version is xhp35 hi without .2.My thought is that, if there any available, can someone name it. My 2nd thought is probably it will be in discussion to made or pre production.
Do you mean that you have seen XHP35.2 HI or do you enquire whether it exists?
I don’t think it exists but I might just not know.
Any flashlight using XHP 35.2 HI ? Flashlight always, for trower,using high intensity led like xhp35 hi and ussually had beam above 50kcd - 100kcd even MOAR. I do know this when xhp70 led been upgrade to xhp70.2. Do check there a topic about this in blf threads.
The 35.2 does not seem to offer much improvement over the current version. Therefore I dont think there is much interest in it.
I haven’t heard of it being available, so maybe when it does come out we will find some type of improvement. Maybe it will handle higher amperage for increased output? Who knows.
A new 3v version of the 50.2 recently came out. Maybe the 35.2 will be available in voltages other than 12v?