I agree that it's a combination of light intensity and spectrum. My plants couldn't up take Ca and Mg fast enough, and they were doing the "far red super stretch" thing that was just killing me. Once I added in 20% more wattage of full spectrum my plants snapped into overdrive. Before I added new light I tried every nute combo imaginable to try to fix the issue. After I backed off the light (at least 24" away from tops now although it's hung at 45 degrees), and added 6500k 80w t-10s into the corners of the room and 2 42w 2700k Cfls above the corners that the Spectra's didn't occupy, my harvests increased, and my plants are now flowering normally. I'm using about 560 watts in a 50" x 60" space and making enough medication for myself.
If you don't like Spectras it's not because you had a shitty light, or that this light could work perfectly as a plug in and play unit, but that it wasn't properly advertised as a "Supplemental Greenhouse light". When I was on the phone with Mike, that phrase was repeated over and over, and now 6 months later it makes much more sense. He was designing the light to be used in botanical gardens and for fruit production (literally micro orange trees and the like) I'm sure that IrishBoy was in fact just a sales rep, or who knows maybe he was getting those results with out supplementation. I never tried to duplicate Irishboy's grow method so I can only comment on this fact. With additional full spectrum light this unit works extremely well. As a stand alone unit it never gave me the results I sought.
Sincerely,
ILovePlants