There is a few flaws to the thought of PAR school. The first would be zoo's, mushrooms, softies, LPS and even some sps don't care about the 400 to 700nm. PAR is a strickly U.S.A. thing, mostly RC, which is why not to many bulb companies use the par scale. Lumans scale yes does have to do with the human eye scale but does go above and below what we can see. Sanjay has done a great job of testing bulbs but has not proven that because a bulb has a high PAR rating your corals will grow faster. To be bluntly honest it has been infurred that the testing maybe be a little onesided or money driven. A good question is the Pheonix 14k bulb and the giesmann bulbs were give to sanjay around the same time. The 14k pheonix is test rated and becomes the new hot bulb for a few months. Were are the test results for the Giesmann megacrome 14.5k, 22.5k Bulbs? What is the par on a pc, t-5, VHO?
After trying the High par low luman phoenix bulbs for 6 months my corals didn't grow as fast as the moderate par high luman ushio. So IMO par is just a trend. 400nm to 700nm is a only a part of the wave length in which corals use to grow.