300 lumens per watt

[Chrontius]

http://www.ecogeek.org/content/view/1415/

New nano-crystal coating replaces the phosphor in conventional white LEDs while wasting nearly no energy. That's nearly a fivefold increase in bang/buck.

 

[Stromberg]

Existing thread here:
http://candlepowerforums.com/vb/showthread.php?t=191415

 

[DM51]

Please continue here, and I'll close this one.