So it’s not just me randomly choosing options and complaining about not receiving parcel etc. just to ask a real person about why is not my feedback visible? 
Hey Bro, you look like new here. As a Pole, please let me welcome you here on behalf of all the users.
Convoy makes mostly lights with a reflector which means there’s a hotspot and some (depending mostly on reflector shape) spill.
In my opinion the most flody is Convoy Z1, which can zoom the beam. By rotating the head you make the beam wide or narrow. Contrary to reflector flashlights, zoom (aspherical lens) give you more uniform beam with no hotspot. But ZOOMies has their disadvantages. Among others, they are difficult to make them airtight and they loose some light (which is emitted on too small angle to hit the lens). So if you don’t mind the disadvantages, a zoomie can give you both: focused or wide beam.
Alternatively you might want to search for flashlight with TIR lens. TIR lens replaces reflector, also loses some power (but not as much as zoomie), but can mix the beam and regulate it’s width permanently.
Today I’ve received Seeknite X6s and I’m really impressed by it. It’s like Astrolux X6, beautiful Nichia 90+ CRI beam and lots of flood. Actually it’s way more floody than Emisar D4s with XP-L HD. It’s still available and the price is IMHO awesome considering what you get.
Anyone knows the Cut Off Voltage for M21C-U XHP70.2 with the new ramping driver
Does it have Low Voltage “Protection” or just Low Voltage “Warning”
The listing shows
Is the S21B compatible with the new 8A buck driver? I’m not interested in the output so much as the additional efficiency.
My S21B flashes out 5 Volts at battery check with a recharged battery 
It seems to be correct if voltage is under 4.00V.
Well, the 8A single cell buck driver is ∅22mm so for as long as the S21B uses a ∅22mm driver it should be compatible.
I think the S21B uses a ∅20mm driver, but since the S21B host advertisement lacks this information the only thing worth saying is the following: Simon, pay attention and good care of the information provided with your products. Your product advertisements must provide all customer required information.
Now that I'm here, I will also seize the opportunity to say that as a rule anti-reflective coated lenses damage the tint and CRI of flashlights. This of course is a way to tell Simon that some customers would prefer to order flashlights with good quality non-coated lenses, namely those who care for tint and CRI and less about throw.
You can read more about AR-coated lenses here and in the thread: AR Lens coatings - just a gimmick?
Single layer AR-coated lenses increase output very little and the price is the obvious “beam greenery”. The solution is multi-layer AR coatings (5+ layers), or no coating.
The information on the driver diameter has been kind of inconsistent, as you said the host listing is sparse, and the only information I’ve been able to find was this comment saying it was 22mm and this comment asking about using a 20mm to 17mm adapter to put in a different driver.
Well, that's odd cothyhu77. Better then wait until Simon notices all of this and decides to answer himself.
The driver manufacturer said that the ramping speed was adjusted, but I still think it’s little fast.
Good news Simon. If also M21C-U will be updated with new driver with fixed ramping?
What could be the reason for the step down at 3.8V? It’s almost winter right now so I assume Thermal stepdown would be a non issue right?
Plus 1
Simon, someone is asking about the driver size in the Convoy S21B. Others would also like to know. This lack of information in the S21B host advertisement is a discouraging nuisance. 
S21B driver is 22mm. It was described somewhere but i forgot where.
Anyhow, seeing model running CULPM1.TG @8A and looking at Convoy site will tell you that only 22mm is working with 8A. Smaller drivers are 6 and 5A
Now with a bit of detective work I’m sure the S21B uses 22mm drivers not 20mm, check these images I pulled from AliExpress:
Customer picture of S21B
22mm SST40 driver
20mm SST40
I still want Simon to confirm compatibility with S21B and the new 22mm 8A driver, though, since for one thing the new driver uses a pin contact instead of a spring and there might be other things I haven’t considered.
I think when I reviewed the M21C-U it had actual low voltage protection. To quote myself:
I won’t say the flashlight is perfect but it is one of my favorite flashlights in quite a while. The driver is very efficient and well regulated.
Reason for the pin contact in the 8A “buck” (hope it were boost-buck) driver is conductivity, as even high conductivity springs could have problems at 8A or close (with just 10mΩ of resistance a spring dissipates 0.64W as heat when 8A crosses it). Simon and/or the driver manufacturer played it safe this way, but it has drawbacks, namely for people who really need damping or shock absorbing contacts (i.e. hunters for example).
The solution, of course, are really high conductivity springs. A bypassed spring can do, but a durable spring bypass requires careful work, giving the wire a coiled shape. Problem is the contact surface under the pin of the driver, it just has the size of the pin contact and is too small, unnecessarily forcing spring modders to remove the solder mask around it.
Let me also say that, in all honesty, I think 8A is probably a bit over the top. We know the CSLPM1.TG peaked at 8A or just a hair above, and imho it's over the top for it. The wrong thing about this is we don't have any CULPM1.TG tests. So actually we still don't know how much higher is the 4040 CULPM1.TG going to peak over the 3030 CSLPM1.TG. And honestly, it's the same led, only the footprint changes. Nothing else to say, except that being able to configure a driver's output current in firmware would be a godsend. 
P.S.: low voltage cut-off is overall set too high in drivers. Bear in mind that drivers don't see the actual battery voltage, they see it after it goes through springs, contacts and switch. All of this causes voltage drops, the higher the current the larger the drops; therefore, the actual cut-off ends up being at a higher voltage, namely if running in high current modes. In essence, I think driver cut-off voltages should at least drop down to 2.7 or 2.5V. After all, I've yet to see a battery complain about a low cut-off, namely when datasheets specify 2.5V (and I've seen lower).
Fri, 11/20/2020 - 04:55
gchart. Thank you for the detailed response.
I also think it is almost a perfect flashlight.
What do you think what could be the reason for these random step downs at 3.8V?
The driver currently in use is not a new batch of drivers
22mm driver for S21B