@Fritz: every sk68 I have seen has this thin piece with the driver not touching the thick part of the battery tube. It just is a bad design (too thick walls where it is not needed, too thin where it matters), and also I don't think the sk68 is particularly goodlooking. The reason of its popularity is that it is very cheap, despite the design it just works, and the optical lay-out is very decent. And no-one bothered to make a better cheapy zoomie with the same lens.
very nice, if you put on anew LED and move all the circuitry to the remaining half you could have a functional light 
perhaps you should do a giveaway with the condition that the winner does this (and if a way can be found to use half an LED)
I like the SK-58 better, except when the extra mass and area are needed for cooling.
I still think the pill touched at the bottom, at least in the mind of the original designer, because otherwise why cut the large diameter threaded hole so far down? If we can’t find them like that, we can still put something to fill the hole.
So the lens is just pressed into the bezel?
I don’t see anything but pressure to hold it in.
The SK-58 has a similar space under the pill. Perhaps the thin section is to keep the body from feeling as hot. I am imagining a management decision based on beta testers complaining about it feeling hot. That doesn’t invalidate the fins on the 68, because they do keep it from feeling as hot.
What about the structure? How does the length of the pill affect the strength?
Nice job on the cut! 
Anyone willing to volunteer a nice FourSevens XM18 to djozz to saw in half ?
Love the effort that’s gone into this review!
Well done, we should now refer to this light as the Sipik SK34
You wrongly assume that expertise and finetuning has played a significant role in this design. There once was the Nitecore Extreme Infinity:
(BTW, it is a reflector based light, not a zoomie). And someday a chinese factory made a zoomie stealing the design, I assume that that first clone was the Sipik sk68. It was done fast and cheap without much thought, but it appeared to work well and eventually it started selling quite well. And that last thing, and only that last thing, is what triggered the chinese industry, and the response was not let's make it even better, no, it is: let's copy that. And later: how can we make an exact as possible copy even cheaper.
If the first designer had bored out the pill cavity a bit less deep so that the pill touched the battery tube on the underside, the heatsinking would have been great, and that great heatsinking would have appeared in each clone. But he didn't, and the light worked and sold well...
Here is your review…ok? Thnks. Bye
I know all that, but don’t believe that a designer adapting a reflector light shape to a zoomy would miss a small change that would improve both the heat flow and the mechanical strength.
Honestly, I don’t think the designer really cares. Its cheap, lights up and doesn’t burn out within the 45 day paypal dispute window, its perfect! Next.
Looking in Alibaba, the first listing I find for an SK-68 says “Supply Ability: 50000 Piece/Pieces per Month”. I don’t suppose the designer expected that much success but I think he must have taken the project seriously, probably more seriously than the one who designed the obscure Nitecore Extreme took that design. He relied on Nitecore for style, but did his own engineering. And he got the most important part right, at least, the production cost.
Lol what an review, very original idea. Cool beamshots too 
This is the most informative review I’ve read on flashlights. Congrats and thanks.
Now, I’d love to see a more high end flashlight reviewed in the same way, but that would be too much to ask.
if you pay for the flashlight i bet someone would be willing to do it for you
Thanks Explicit, I may split a high end light some day but perhaps cheapy's are the more fun because the design flaws are obvious.
Welcome to BLF! :-)
I’d certainly not be willing to pay 100% by myself, but I’d gladly participate in a crowdfunding project. I’d be willing to participate with, lets say 0.05 Bitcoin (roughly $25). If this “review” project is backed by 20 people the funding would total to 1 Bitcoin. I think this would suffice to “review” a $100 flashlight. Anyone else interested to participate?
Thanks djozz, I am glad you noticed that it was my first post.
Hahaha yeah!