I love the looks of it and it seems to be well built (integrated pill, copper PCB, a lot of cooling-fins, a lot of material under the MCPCB) and doesn’t cost too much.
So - does anyone have this flashlight and can tell me if the beam is nice?
I’m not sure if the C12 finning is the best possible design, but I’m sure they do something, they are increased surface area and near the heatsource. And to me they look like they significantly add to the heat shedding to the air compared to a C8.
No air flowing inside fins.
Any heatsink made to use without fan should have 5-8mm between ribs. Otherwise air flows same way as there is solid surface.
It is hard to explain. I hope somebody from forum have equipment to take thermal image - X6 is good example to show what I am saying.
Also, usually people think that ribs surface is smth special and more important than solid flats and curves. This is not so, in most situations ribs surface have half less air flow. This means thay you need to take just half of ribs area to calculate heat spread increasing (i.e. 200sq.cm + 20sq.cm/2=5% increase, all numbers are random). In most situations you need hundreds % to feel difference (modern leds quad/triple light have 20-30w power with 5-10w host abilities).
To avoid anyone’s confusion with what wstrachan wrote above, I wanted to point out that, although the name is the same, the KD C8.2 has the traditional C8 body style and looks nothing like this light, the Manta Ray C8.2 is a completely different looking light, and fits 26650 cell.
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Somewhat similar to KD K5S but with knurling and no stainless bezel, there’s also an SST-40 version: