R would be outside of white Luxeon III binning (S is the minimum) ... but I'm not familiar with relative standings for colored LEDs. Assuming near top-of-bin flux, and 3W actual power, "R" flux would be ~20% efficient.
Check out the "Luxeon binning" link in my signature if you want to know what the codes really mean.
Flux bins for royal/dental blue are in milliwatts of emitted power instead of lumens because the primary application is adhesive/epoxy-curing.