Fromthe world's leading lighting experts: The lighting Research Center at RPI's chool of Architecture.
Overview http://www.lrc.rpi.edu/resources/new...cement8511.pdf
The real info, on LED replacements based on real science by real scientists, no anectodes, Everything that is currently available and reviewed that you ever wanted to know about LEDs:
http://www.lrc.rpi.edu/programs/soli...edProjects.asp