Nice beam-shots. Thanks!
Seems very good to me, Low-High-Turbo modes (1 lumen, 70 lumens, 400 lumens). Hope the light will be succesful.
Success depends on you, guys 
If you like our project please support us on Kickstarter:
Extremum on Kickstarter
As a ‘thank you’ for advices we’ve received on this forum we’ll make personal laser engravements for BLF forum members for free. You’ll tell us in private messages on kickstarter what text you want to see on Extremum.
Sorry, but it IS a jump, a BIG jump.
it’s 8 times as much, that’s 800%.
Nanjg 105 and AK47 have figured it out long ago with their 10% - 30% - 100% mode spacing.
Each step being approximately 300% (3 times as much), which is just about right.
In this case that would be around 40 - 120 - 400 Lumen.
This “looks like” a doubling of the output, because the human visual system is indeed not linear.
Still wondering what the purpose of a 1-5 Lumen mode could be.
@ProjectOne:
Have you considered or tried a TIR optic?
That should get a bit more light out the front.
We can’t found tir optic that can fit in 10mm circle ;(
I know they exist, because other 10180 size lights use them, such as the DQG Hobi. But I’m fine with a regular lens like your lights have or even just a plain smooth reflector.
How is the parasitic drain? That is an eswitch right?
Parasitic drain is ~0,005 ma. That’s a current for a processor to be in waiting mode.
@ProjectOne, I’m looking for 10180 batteries. You say that you found some real 100 mAh ones. Could you tell us what are they?
In specs it said 400 lumens?
UI suggestion:
Press and hold from off - low (1or2 lumens?)
Press and hold from on - turns light off
Single click when off - memory/last mode used
Single click when on - advance through modes
Modes - low/mid/high
Simple, effective.
I could go for that. It’s not much different from the way I use my Olight.
Oh, well, I missed the following post:
I searched kosmodrom.ua for “10180” and found no batteries…
ADDED:
I don’t see such batteries on aliexpress on ebay either.
Well, I don’t know if this will be helpful, but here’s the MecArmy 100mAh Li-Ion 10180.
No strobe and only 3 modes, then I’m very interested
Thanks. Actually I’ve been searching for this battery before and I’ve seen this shop. It’s probably the last one with them in stock. Sadly, $64 for shipping kills the deal.
I don’t know if they are the same as used in the Extremum (guess not), but take a look (I used Tinyurl to make the link shorte, as the original has 5 or 6 lines):
All from AliExpress store.
Hope it helps! :+1:
Thanks, though I’m not adventurous enough. At least at the moment.
The Extremum ones were said to be labelled as higher capacity than that.
I read about some comments about chinese “100 mAh” 10180s that were 70 really, so I’m not quick to invest. Especially that I don’t have equipment to compare them with my old AWs.
3 output level:1-50-200
from off:
single tap:to last mode memory
long tap:moon
double tap:highest
from on: single tap:next mode
long tap:off
that’s the UI i would like to see