Hi, friends, what’s the most suitable driver for SBT-90.2UB ?
Depends on what you want to do with it. Crazy output? Regulated output? Long runtimes or short unregulated runtimes? My experience is that regulated drivers are the best, like a buck driver. The Amutorch DM90 has a nice one, and so does the DM80. The XT60 nb90.16 and xt45 nb90.16 also have high power, dual channel buck/fet drivers that would run the Sbt90.2. Badicslly you need a driver that will supply 25 amps on top for the best output.
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Thank you, where can I find it
Thank you for bringing Amutorch with buck/fet driver to my attention. You are very good at helping me spend my hard-earned money. 
I am interested in the XT60 but there doesn’t seem to have a review of this light with SBT90 (only the NB90). XT45 w/ SBT90 was reviewed and has a strange thermal response, stepdown to zero lumen!? Any comment? I wonder if XT60 with SBT90 might do the same? TIA
I was able to find him in China.CFT-90 WB but I haven’t been able to find a driver yet to have a 40A
Would it be possible to use 2-3 amutorch drivers in parallel? Then maybe you could swap a current sensing resistor to fine tune the power?..
@Neal might be able to supply you with the drivers w/out having to buy the complete flashlights…
Can I use 2 (20 A) drivers ? Then it give me 40 A output power?
I believe yes. But I don’t think I’ve seen this being done with anything else than 7135 linear regulators.
Of similar stuff, @Lexel has done some drivers where the control was done by a single MCU but then there were effectively multiple buck drivers in parallel.
@thefreeman could you please share your thoughts on the feasibility of using Amutorch drivers like that?..
Linear drivers can be paralleled, Buck or boost driver can be paralleled only if they use high side current sensing, that is the sense resistor is placed between the output of the regulator and the LED+. High side sensing drivers are rare, I have actually never seen one, because low side is much simpler.
Thank you for correcting me thefreeman
Actually I have seen a few, the LM3409 based drivers use high side sensing : the buck drivers from Lexel that you mentionned, the BLF GT XHP35 and a couple of others.
Heres a thought. Sonce you wamt 40A, and there really aren’t any drivers around that can supply that, save for some of the crazy ones in the Nightwatch lights. If you really don’t care about modes, you can just direct drive it with maybe a series resistor and a pot for brightness adjustment. This will be inefficient though and has drawbacks (like lots of heat since excess voltage not used is dissipated as heat), but will guarantee you really high output (limited only by your resistor and the internal resistance of your batteries and wires, etc.
You could buy a Nightwatch light like the NS59 or NI03S, pull the driver, and experiment with it. If you know someone in China, TaoBao is another good place to look for drivers/etc.
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