It has 1500 Lumen, double 21700 battery, 1100 meters of throw…and 3 1/2 hours of continuous turbo!!! This might be the best thrower deal around now and with great performance. Very interesting.
Yea, I was excited when I saw it too. I’ve always struggled understanding electricity. JaredM talked me down. Something must have got lost in the translation. 3 1/2 hours on turbo isn’t possible.
It’s probably one of those marketing gimmicks where they count the step-down to a lower power as being part of the “turbo” mode.
Sofirn was so kind to send me a sample with batteries for a review. I hope to receiving it quite soon, so I can do a runtime test.
You lucky bastard 
Barry asked me to review the 5000mAh 21700’s with my CBA, so I asked to also review the SF47T while I’m at it 
. He first said he’d send the cell with a free SP35 but I already have reviewed it, thought I’d offer to review the SF so they get something out of it.
It’s not a marketing gimmick, it’s the ANSI/FL1 standard that’s to blame. That standard is misleading in itself
It's nice to see an updated 2 cell light with 21700's, and probably what is a Boost HX. But no built-in charging, and high amp buck drivers have a bad track record for reliability, but we'll see.
Looks like it has a power tail switch - could be a pro or con.
Looks nice, but they’d do better with a constant current linear driver like Acebeam uses in their Osram powered lights. A buck driver is complicated and expensive and like TomE said, may have reliability issues at over 6A. 1500 lm out of that is around 7 or 8A.
So…are you saying Convoy’s 8A buck driver isn’t a good choice?
Built in charging? For a dual cell model in series, that’s not wise if unprotected cells are bundled. I don’t like built in charging unless it’s in the threads protected with a good oring.
What I don’t like is you can’t switch it into standby via the side switch. They almost completely copied the Yakorsei GD12 UI
Sofirn has had a reputation using springs that limit the current, so it may not hit 8A.
According to my information, it’s a CC buckdriver with an operating voltage of 6.0V - 8.4V (=2S) using the Osram Ostar Projection Compact KW CULPM1.TG („Boost HX“) emitter with a maximum current of 7A. I suppose it’s outfitted with the new (improved) ATR that comes with thresholds of 45°C, 55°C and 65°C to automatically regulate brightness up and down.
I would also be interested to learn more about reliability issues with buckdrivers. Reliability in terms of impact resistance because of sensitive components or in terms of constant output when batteries get depleted?
On another forum I read that at e.g. 6A the dropout voltage of buckdrivers leave very little room for constant regulation as soon as a single battery‘s voltage is down to 3.3 - 3.5V. Would it be possible to resolve this issue by using two batteries in series to have a wider voltage range between input voltage from the battery and voltage applied to the LED?
True. The SP33 v3 had springs that really limited the current a lot!
The stock SP33 V3 gets over 3200 at 30s using a 40T. The unit 1lumen reviewed was defective if that’s what you’re referring to.
About the reliability of buck drivers, I'm talking in general over the years involved in this hobby, higher amp buck drivers have been notorious for failures over time of use. We used to buy them from our common vendors at the time, paid decent money for them, and we'd get a few months out of them. I got contacted recently by a guy who literally has a pile of dead buck drivers, most from MtnE for example - yes, unexpected but true. Hank used to sell Chinese manufactured ones and those used to be prone to failure, and from what I can recall, he dropped them because of the high failure rate. Hank wasn't the only one, but again, another example of a good dealer having problems with them.
Why did this happen? I don't know, but could speculate on poor quality or counterfeit parts which happens since the good buck driver parts are so expensive, or poor designs resulting in driving components out of tolerance and result in failures over time. There's a lot of things that have to be taken into account in the design - there's signal noises and glitches that are not evident to the user or the LED output, but can cause components to be operated out of tolerance which over time, can result in failure. I would be suspicious of an 8A buck driver for under $10, because the parts costs probably doesn't exceed $2. A good inductor used to cost more than that.
As for Simon's 8A buck driver, it it's not producing 8 amps as spec'd, I'd be concerned, but I'd be more concerned for long term daily use. Really it's probably too early to say, but we'll see. Hopefully the core components have been improved, but as we know with the good FET's from Chinese sourcing, we know they are counterfeit and just a matter of how good the counterfeits are in quality and consistency.
Thanks a lot Tom E! 
This is quite interesting as there’s little to find about longterm reliability of drivers. So far I was told that flashlights using sensitive components like inductors are more likely to fail due to severe impacts whereas simple direct drive lights are basically indestructible. I am curious about the new Lume1 CC buckdriver Fireflies is using for their new lights. I hope their higher pricing will also be reflected in high quality components. I must admit I have not followed the Lume1 driver thread, though.
I have more confidence in the lume1, taking into account the designer, whether the driver signals have been properly scoped in all scenarios, and selection of the components.
At work, we do all sorts of life testing. We just ran a treadmill at 5 MPH for a total of 10,000 miles because of changes made in the amp. We also get many failed units/products back from the field to root cause and we see resistor and cap failures, lots of other things, again, even though these products have done the calculated years worth of service in life testing. We also experience "batch" problems with parts, plus frequent EOL (End Of Line) problems with finding substitutes, if available. Our so-called Product Development dept. is more or less a sustainability dept. now. If you think SW/FW is a nightmare at times, electronics is a constant on-going affair.
well put tom