Thanks for taking one for the team to verify this.
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His earlier response “Usually, battery reverse connection protection is the most basic function.” Yes, usually…
I guess his supplier told him it had RVP.
P mosfet 0.50$ vs 0.05$ schottky diode 
But then it is also his duty to check this and not simply believe “yes, that’s definitely the case”. After all, he sells them, so he has to ensure that the specifications are met and in accordance to the given item description.
I don’t know if it was there before, but now I can’t find any information about RVP in the item description for the 12 A 22 mm FET driver in question.
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Is it possible to “lego” within the M21 series?
Could I put a M21B switch tailcap on a M21E ?
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Simon responded and he said he’ll fix it by producing a buck driver and getting rid of the FET. That’s an exciting way to fix something 
Well, that was a good end result.
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That sound amazing, if the new buck driver is able to produce as much power. The fet was rated at 12 amps, but was reported to deliver 22 amps. Did Simon say anything about how many amps the driver would deliver?
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Hopefully also available as more powerful 17mm variant, with 12 Amps or even more. The 3V 8A driver is fine, but sometimes it would be nice to have a more powerful one 
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Or give us a something like the Lume1
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This would be absolute banger. It is no secret that most of the drivers are completely outdated and that also many drivers need an upgrade, in UI, regulation, features…
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This is true. I finished testing the four newest flashlights from them (E90, E04, L70, L60-Mu) and they’re fantastic. The E07x, X4, and X1 series are also great all thanks to that Lume1 (or x1). Only Hank has an answer and it’s because he uses Lume divers (as an option). It would be awesome if we could get them bare.
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Especially in standard dimensions (17,20, 22 mm).
In general, more standard-sized high-tech drivers for clicky and momentary would be good, since there are basically none on the market.
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I quess it will be asynchronous buck , similar to 3x21D
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I have suggested 20A since the SFT90 has a max 20A rating.
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That sound good. I was actually also thinking of using such a driver for the new SFT-90. Looking at the graph form @koef3 , publish yesterday, it seems like 15 amps is the sweetspot. 20 amps would anyway cause a good margin for any other use though.
Simon just added it to his shop, and the price is excellent:
He also has a a datasheet linked!
His bin number would be 5600K, but I think that is a typo and he has the same 6500K model as Kaidomain had…
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The preliminary one.
The emitter he sells are still engineering / pre-production samples (SFT-90X-WS56-M2-ENG-J9-VL-BA).
Yes, but nobody but you had access to that so far, so Simon posting it publically is useful
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Yes, defintely 6500 K (BA). Should be slightly above BBL, but not too far. (hopefully)
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J9 BA bin, sounds nice.
Convoy offering the SFT-90 is another good development. I’m glad it happened so soon.
Thank you Simon, for uploading the datasheet. 
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