What does 1S and 2S stand for? One-sided and two-sided? 
1s = single cell (4.2v)
2s = two cells in series (8.4v).
A 2s driver is not a buck driver for running a 3v les off 2 series cells, theyāre all linear drivers unless specifically called something else*, the led voltage has to match the input voltage.
*Lexel does have some buck drivers.
Hey Lexel, let me know if you need any other info from me. Thanks!
Hi Lexel do you have a driver for BLF GT with a xhp70.2?
last time I saw your post on FT03 thread, I do recall that your are going to build Ft03 mosfet driver anduril?? I think it is now still in progress?
yes I have the boards here but need some time to test the linear drivers and tune them
H03 driver with AndĆŗril arrived yesterday, and while I had some other duties, I couldnāt resist the temptation and initiated ālate night solderingā sequence to revive my driver-dead H03 as soon as possible. It had been lurking in the shadows for too long. I already had some expectations, but wow, with this new heart and brain, this headlamp is a whole new species now! Driver build is awesome. Paired with the mighty sword UI, the lamp now has tons of super functionality, better flexibility, yet is even easier to use (single click to off is simply more natural).
Many thanks!
Wow, greats!
How does it differ from original driver? Improvement? Efficiency?
Iām also had a thought that ft03 had some flaw in it driver, Iāll just guessing those. His booster?idkā¦
But hopefully you will filling those gapā¦
FT03 driver is to supply a steady (lower) fixed current for small die LEDs like Osram White Flat
Much less lumens but much more throw
Did this weekend a lot of drivers
Hello Lexel,
I would like to get an Anduril driver for a H03, with a long spring as the light currently shuts off with slight knocks or jolts.
Possible?
Hi Lexel,
Could I place an order for a Skilhunt H03 driver with Anduril please?
Thanks, Dan
I got a problem with recent H03 design and had to order a new one, will take a bit time
Thatās cool. I couldnāt make make a driver myself, so I can sure wait for you!
new batch of 21mm drivers have arrived yesterday
Excellent news!
Could I please have two, with longer springs and flashed with Anduril?
PM me your payment details and Iāll sort that out today 
JD
Iād also like to get an H03 driver with Anduril, please.
Hi Lexel, would you be able to share the mode tables you use for the stepped ramp levels in anduril for the H03 driver? Iām interested in which modes use just the 7135s for regulated output. Thanks.
stepped ramp is calculated by the firmware there are no discrete levels, also the Ramp ceiling plays likely a role
Hi Lexel,do you have a driver for Q8 xhp35? I would like place an order.