vinh is getting better bout tracking the mods, with V2, etc. Way back when, vinh and us all were modding TN31's by adding resistors, and tweaking up amps little bit, being careful, etc. That is until someone, maybe vinh, tried bridging them, then the modded TN31 really hit the pinnacle of it's performance - reigning LED throw leader, until dethroned of course... 
Why? Its not regulated. Seems like linear performance to me. Might as well have been in parallel, which is safer.
True on parallel being safer. The only advantage I can think of is that less stress may be placed on some components due to flowing 4 amps verses 12 amps. Maybe slightly more efficient, but I don't know about that.
Whether that's enough benefit to justify the risk is up each user.
EDIT: Clarified first sentence.
personally I would rather have high voltage and a boost/buck driver than a 4.2v setup for multiple leds (due to higher voltage of xml2 that is)
but thats just my opinion, like you said some might want parallel since its safer
In for one.
This is a 3 cell light, right?
Right.
Me too, but judging by the unregulated performance (seen in the reviews) this light does not use a boost or buck driver. If it uses one, it certainly does not seem to act like one. So it does not utilize the typical advantage of cells in series. Which is why it might as well have had the cells in parallel and suitable driver.
The obvious reason for them to be using the series battery carrier is due to all their other lights that are using it. In those lights, it seems quite genius.
I’m interested, depend on final price.
It just can't keep up the regulation on turbo. Lower brightness levels are well regulated.
Quite similar to TN30: L6 not really regulated, L5 and below are.
See these graphs, borrowed from candle lamp's reviews:
Mark me as a maybe……all depends on final cost shipped and when we can get them
Count me in on the interested list for sure, if the price is around what the K50 went for I’m sure I can swing it. (K40M deal would be amazing as well 
)
Seems like typical unregulated light to me.. I may clarify. I consider a single cell, single emitter light with 7135 based driver to be unregulated despite that its regulated as long as cell voltage is higher than emitter Vf. Sorry if my choice of words or viewpoint of regulated is wrong.
If it cant do regulated output on turbo/max output mode, then its not regulated from my point of view. Its not like 2,5A to each emitter is that extreme "turbo" for such a large light. There are budget lights with similar cell/emitter configuration that can do that output regulated from pretty much full to empty (7,5A buck driver).
Ill quote selfbuilt
"On max, the light appears to be largely direct-drive – but that depends somewhat on the actual 18650 cells used. As you can see above, my 3100mAh cells were able to maintain a relatively stable output for about 10-15mins, before dropping off in a direct-drive-like way. "
Typical behavior for an unregulated light. I don't mean to talk down on the light. Im still debating weather I should jump in on this GB. Its an attractive light.
*Cough* Interested *cough*
I have a Vinh modded one, and it's really a very nice smaller light, compared to some of the others out there. The charging is a bonus.
I wonder if the driver in this light can buck down to 3P Vf well.
RyanSOH may have some input on that. He built a 3W laser using the TN30 as a host. He said it stayed well regulated down to like 9 volts with that emitter.
Yeah, no awww, I mean how can … ummm yeah…. I probably shou…. OK, Im probably in.
The testing pics from DTR's thread on the 9mm 445nm diode are not pulling up. If I recall correctly, the Vf of that diode ranges from like 3.6 to 4.8. So the TN30 seems to buck down nicely. Just need to figure out if the X40 L2 does and at what current it can run in such a scenario.
I would be interested depending on that.
In for 1 or 2. thanks the
If price is right!
I am interested in 1 piece BUT don’t do like OL did with K50 where you had to pay immediately right now. 
I don’t keep a bunch of cash on my bank account (that would be dangerous with all this group buys 
)
So, when I see the price first I had to ask my boss to let me out of the work because my (stupid) bank has
identical working hours as I do and that means I need minimum 3 day, today you tell me the price, tomorrow
I ask my boss if I can be late and he will say: “OK, you can do that tomorrow” and that’s already third day…
It is complicated but efficiently stops me from overspending :bigsmile: