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Found out about something pretty amazing, the Fraz Labs Tiny Nugget. Pardon if this sounds like a sales pitch, but I've personally never heard of something like it.
It offers dimmable brightness with only one moving part (screwing the back portion further in or out). Uses no buttons, no wires, no solder, no PCBs. The emitter and every other part is user swappable (again, because there's no soldering) and the whole thing is extremely robust due to the construction and built to last.
It works via something called a Quantum Tunneling Composite. From my understanding, that's a small piece of composite material made of a polymer and small metal particles. When uncompressed it acts as an isolator, but as it compresses its resistance drops exponentially as the quantum tunneling effect allows electrons to pass through despite the metal particles in the composite not touching each other. There's a limit to how much it can compress (about 70% at which point there's basically no electrical resistance left, the composite breaks if it's compressed much more) but as long as a stopper prevents overcompression it can compress and decompress a very high number of times.
The whole light, almost all of its parts, is made in Arkansas. and costs about a hundred dollars. Its is a bit bulky looking; the smallest one in the image, fitting a 18350/Cr123 battery, is 3" long. Should the composite break (I'm sure that spares can be gotten cheaply from the company, and maybe made by oneself with an appropriate QTC composite material) due to the construction it can be taken out and the light will still work as a direct drive.
Problem is only they're all out at the moment (small shop, relatively new product) and at the moment there appears to be no shop who imports them into europe, so I can't get one yet either.
