The problem with readings that are done using an Apogee Quantum meter is that for any of the "blue" bulbs they will read anywhere from 10% to 15% low (or even more) as the response curve for the Apogee is low in the blue part of the spectrum. If you use a Li-cor meter (much more expensive) you can get a little move true reading. I spoke to Dr. Sanjay Joshi about this during a conference, and he confirmed this with some of his own readings made using a Li-cor meter.
So take this into account and add back say even 10% on the ATI Blue+, and all of a sudden the 311 is now 342, which is right up there very close to any other tube. If you add 15%, your now at 357, which is the same as the Sun Pro and higher than the Aqua Sun. So in the end, you can get the same PAR levels using quality blue tubes as the white.