Not to be a butthead or anything, but the Gerber Trio (as well as the similarly bright and long-running Inova X5T) has very nice runtime. We can always hope the next 'bigger, better, brighter, faster, more' product comes along but realistically, how much more runtime than the Trio or X5T are you expecting?
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I do have a couple Princeton Tec Impacts which is a basic single 5mm LED light with an optic that runs on 4 AAs. I've had them for almost two years and I've used one a LOT and it's still on the same betteries that came with the light. I think it's rated for something like 140 hours continuous or something. I was thinking of trying to put one of the 13 lumen 8mm or 10mm LEDs in one of them.
Edit - and Princeton Tec makes a 1W Luxeon version of the Impact called the Impact XL which is not one of the brighter Lux lights out there but is rated at about 50 hours. Off the top of my head, I don't recall how brightness comparres to but the XL is obviously brighter than the regular Impact or Impact II.