BTW, I think the CR123A is the best available cell for high powered lights. They're more energy dense and higher voltage than AA/AAAs and will typically run harder, longer. They're not really hard to find, either. Every Wal-Mart I've ever been to has them (although the price isn't great). True, you won't find them at every gas station or anything though. AA/AAA have a place but for my main light I prefer CR123A. I buy mine in bulk online for around $1/ea. If I can carry the light carrying spare cells isn't usually a problem.
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“I'd rather have questions that cannot be answered than answers that can't be questioned.” —Richard Feynman