Yeah, getting these LEDs in China is very difficult, so that’s no dice really.
A question about the S21D:
A few months ago when S21D came out, there was no other driver option available, now there is the 12A FET and the 8A CC driver.
What was the driver in S21D when it came out?
8A buck driver.
Simon, any working coupon code right now 
ESW5KOXA1572 was working for yesterday for me but stopped today. Give it a try
If you visit the store through the ali app, there are plenty of store coupons to choose from depending on the spending amount.
Does anyone know of there is a difference in efficiency between the 8A buck and 8A CC driver in the S21D?
Hi Simon, any chance you will have a quad 519a version of this?
Thank you,
does the 8A CC driver have great advantages over the 8A buck driver?
Which one of these 2 would be preferred, as the 12A FET driver should not be that good as I read?
A side switch and USB charging version of the S21D would be fantastic.
ESW5KOXA1572 doesn’t work anymore
.AliExpress stopped the previous coupon rules.At present, you can only get coupons on the front page of the store.
The efficiency is the same.
I have plans in this regard.
Looking forward to this one! Hopefully it will retain the buck driver.
prikolow and stephenk
They’re the same driver really, just with some fixes 
Good to know.
This is very interesting, I want such a flashlight)
I’ve got the L8 and the M3-C light in front of me now. I like both but the L8 is not a carry light. Would it be possible to build a new light with the L8 26800 tube and tail, M3-C head, 25 amp driver and use the SFH55 LED? And of course with the optional stainless steel bezel. Another idea same set up with a quad XHP-50.3 LED.