Great question — answering as the UphillTech team:
The design benefit of these emitters is that the brightness comes from a much smaller area. This means that the optics can focus the light into a smaller spot. There doesn't, at the moment, seem to be an efficiency benefit over the best LEDs, except perhaps in low power modes. This is partly because current designs are optimised for maximum brightness. For hiking, if the light is to see where you're going, they seem pointless - the tighter focus isn't what you need to place you feet or spot trail markers. But they do project a tighter beam at long distances, so if that's what you need, whatever the activity, there's some benefit. I won't go into detail on use with weapons - again, that...
Full answer by Chris H: https://outdoors.stackexchange.com/a/27738 (CC BY-SA 4.0).
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