is there a way to mod this light in a slightly less aggressive manner? I mean no blobbing all the resistors together creating a huge hot rod but to exchange them for higher output but still descent battery time? Mine is on the way and I am already thinking of tuning it.
Thanks!
Sure, you can add another resistor that has the same value. It should increase the current, though I don’t know the math so can’t say how much.
Try using the light first. Even in stock form it is very very bright. I would have also liked to de-tune it a bit from where I have it now, but I didn’t have any low value resistors.
Maybe my 2nd light will be tuned and I leave the first as is 
So same value resistor for the 3rd pads should be the way, thanks.
Ramping up for my first two reviews
The S50 and S70
Pics on the details done but too rainy for beam shots
The S50 lit up a nice part of the field next to us will try S70 after dark, can’t wait!
The S50 has a pill that is very easy to remove since there is no side switch.
If someone does not want a (second) side switch the S50 is easier to mod.
Is there a FET driver that will fit in the S70? Looks to me like they’re all too small and you’d need to make up some kind of contact board with the existing driver.
With the stock driver modded doing 9A+ I don’t think a FET would come to play, but what you can do is get a blank board and pot a smaller FET driver on top, it works the same.
I mainly want to do it for a pure side switch UI.
Anyone know the max cell length that can be run in the S70 ?
I note from another forum a poster saying that 67.7mm cells are a tight fit which would rule a lot of cells out ?
My longest Panasonic 3400mAh 18650 can be fitted
It is tight
I will measure them later for you
Thanks very much. I have just ordered the light & want to order 26650 cells ready for it & obviously don”t want to order cells that are to long.
69.28mm
They fit, but it really is a tight fit, I would recommend cells to be shorted for this one.
I know my KingKong 26700 cells didn’t work, but they were only a tiny bit too long. I would expect anything under 69mm each to be fine.
Those of you that have this light, how do you like it? Do you agree with my assessment?
Thanks The Miller & pilotdog, I will get cells no more than 69mm long then, probably unprotected button/semi button top.
Just got to dig through the minefield of 26650 cell specs & claims 
Thanks again.
BTW I haven”t got mine yet but am looking forward to it arriving greatly.
Got a pair of Thorfire C8s” & I am very impressed with the build & finish of them so hopefully the S70 will be equally as good.
I like it, workng on a review.
Made the beamshots yesterday.
Cool thing, at 800 meter is the castle.
yesterday night I looked at the tower after they shut down the show lights.
I looked through a monocular in the direction of the towers, since I could not see it in the dark.
S70 on Turbo and bam there they were! Very cool.
When the weather permits will test the S50 tonight, to see if it can do the same.
Mine’s been working great. Quite a value for the cost.
Running King Kong 26650 4000mAh ICR26650 button tops (67.7 mm) - good fit
and used Sanyo/Panasonic NCR18650GA 3500mAh (69.0 mm) - very tight
Hmmmm…
So for this S70.
King Kong the best bet?
https://www.fasttech.com/products/0/10003591/1263001-king-kong-icr26650-37v-4000mah-li-ion-rechargeable
But it show 68.4mm?
Edited: Vs Vappower 4200
Or Vappower 5200mAh?
Which is more preferable?
Cos i getting “x” numbers of batteries.
For J18/X100 as well, on top of S70.
Thanks.
I was considering King Kongs but wonder if there is enough advantage over a 3400 mah 18650 cell to make it worthwhile getting them ?
On paper the capacity gain is only roughly about 18-20% whereas if you got 52000 mah 26650 cells the capacity gain is roughly 50%.
Obviously I know that the above is dependant on the cells actually having the claimed capacity in the first place.
Your biggest advantage is much less voltage sag. Factory 5.5 amps or modded to even higher and 18650’s get warm and lose some capacity where 26650’s are just sailing through. Looking at the test done by HKJ the 3400 mah Panasonics have 3040 at 5 amps. The 5200 mah Keeppower have 5080 at 5 amps, with voltage staying much higher the whole way. In Panasonics favor I don’t fear their unprotected cell. The 26650’s need to have PCB’s.