Sorry I'll clarfiy my context for efficiency(not the scientific definition) being how far it can reach for how long. As to how they are distributed , the same as the armytek predator 2.5 as in the OP. I can't remember the precise figures- but 5degree hotspot and 40degree spill with a 35000CD beam at 670 lumens ? Its punchy but still illuminates a decent sized backyard at medium ranges. I don't need to improve on this per se, I just need to find a way to replicate it now the 2.5's are gone. A compact size is another benefit, but prepared to go a bit larger if need be...
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