Will the KLX hurt ARC sales?
Hmmm....good question. We will only know once the products being discussed are being sold in numbers.
Perhaps one could ask, "Can the ARC LS and the KLX series be compared?" Well, yes and no.
Both are very small lights, but the ARC LS1 and LS2 are meant to be driven off 3V, be it one 123 or 2 AA's, etc. The ARC LS1 even does a fine job of using a single AA.
The old LS1 might be beaten by the KL1 in terms of brightness. However, I think if one *must* compare an ARC product with a KLX series, it should be the ARC LS2.
Both products have their merits. And both have weaknesses. The LS2 is driven by an all-new "brain," constant current and will give a flat output until the batteries are depleted....at which time it will enter a very respectable moon mode....(and I mean very, very impressive for a moon mode!) And did I mention the beam? It's perfect...with a very nice intense spot. And the color is beautiful. A cool white that leans towards blue, but doesn't really show any purple or violet.
With a single 123 setup, in its most compact form, I believe the LS2 will beat the KL1 for brightness and for flat output.
However, the KL1 is by now means inferior. It adds the flexibility of using 2 123's for a *much* longer runtime (just see the graph that's been posted). Sure, this setup adds to the size of the product, but not much (think E2). Plus, you're talking about a tried and tested Surefire product that can fit on your existing E1, E2, etc. And the price is very tempting.
If you want the smallest, brightest 1watt luxeon star flashlight using 1 123, I'd go for the ARC LS2. If you want a longer runtime and don't mind the slightly larger body (or like using 123's), I'd get the KLX and buy an E2 and E1. Remember that you can make the ARC LS just as big by using a 2AA pack with it, too...
Ultimately, if you find yourself comparing the lights, you just might end up finding yourself buying both. That's what I'm doing. In the end, the differences in brightness (if any) might not really be that great.
The LS3...which will come shortly after the LS2 is another beast altogether. This product shouldn't be compared to an existing KLX product...it's just different. And very bright indeed.....