There are several online suppliers of LED flashligh bulbs. Until they come down from their current $30 price (or until batteries begin costing $10 each), these will be attractive only to survivalists and special purpose users. The same logic applies to special "energy saving" bulbs and the cost of electricity. It just ain't worth my while to buy a lightbulb that takes five or six years of energy savings to pay for itself.
Mine either! One of the articles I read promised that ultimately we'd see a powerful but compact LED flashlight that would give you a month's worth of continuous service on a single AAA battery. That's what I'm holding out for! None of the LED flashlights I've looked at on the web so far come anywhere close to that. Twelve hours seems to be the norm.
I'm sorry I didn't bookmark it because I can't find it now, but right after posting that I actually found a big LED flashlight discussion forum on the web where all they talk about is LED flashlights: Where to get the best ones, where to get the best deals, uses for (and no one mentioned spelunking!), new developments in, etc., etc.
LED flashlights! Six months ago I'd never heard of 'em. And I definitely never heard of this cool tungsten stuff. I live in mortal fear that one day I'll wake up, 100-years old, and somebody will tell me that men landed on Mars twenty years ago. Like that poor old drooling centenarian I saw on tv once who couldn't believe we had landed on the moon.
You can get a nice little LED flashlight at Walmart for $8. It's called a Dorcy Cool Blue. The light is very white and stays that way even as the batteries weaken although it does get dimmer. To me the whiteness of the light makes it seem brighter than it really is. It works well for most tasks around the home and it's nice knowing the batteries won't have to be replaced for a long while.