When I saw Edison screw LEDs at Sam's Club (the kind that fit in a light bulb socket), I was excited. Then I crunched the numbers on lumens per Watt, and I was disappointed. They're a little more efficient than CFL's, but not much.
My GE EnergySmart 13W bulbs are rated for 825lm, or 63lm/W.
The white StarLED is rated for 87lm/W, before the 120VAC->3.3VDC power supply and regulator.
LEDs have advantages over fluorescents, but the ones I've seen so far don't save substantial energy when you need hundreds of lm.
LEDs have a big advantage if you only need a few dozen lm, though. I'm using a 12V T10 automotive LED to light my desk at night, which saves me from having to turn on a 13W CFL. It's powered by my PC.
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