LEDs for lighting vs. flourescent

Cree presented strong energy results for street lighting and replacing incandescents, but what was interesting to me is the replacement of T8 flourescents with LEDS still leading to a 30% reduction in energy. Why? It turns out the optics of a point source lambertion radiator (LED) allows much more efficient optical design. Cylindrical radiators or even HTS lights have radiation patterns that lead to losses and ultimately make them less efficient than LEDs. Now, the 30% savings is not sufficient alone to drive deployment, but start to combine the better quality of the light, the better color control, and other potential advantages and it is a deployment option even in the 'walmart' scenario.