As always, it is a bit misleading to argue in terms of candela since this refers more to photon focusing than photons generated. The best luminous efficiency is the new T grade Nichias. B1T runs roughly 40Lumens/W up from ~25Lm/W for B1S thus making these LEDs more efficient than the best Luxeon star. For now. At 60mA they put out about 40Cd. The latest Jupiters also beat Luxeon but it is perhaps more realistic to presume that the race is neck-in-neck for efficiency between Luxeon, Nichia and Cree.