I'm as well versed on it as you are but my understanding is that while greatbfor veg they've yet to produce a unit that's a sufficient standalone for flower. They work but side lighting is recommended in flower.
It seems that many (if not all) of the plasma grow lights I've read literature about attempt to mimic the spectrum of natural sunlight.
If you take a look at the claimed spectrum analyses, it does look very tempting; they appear fuller than even multipurpose LED arrays with 'the works' (blue, magenta, and warm and cool whites all inclusive). That being said, I think your magenta/red-focused LED's bear advantageously over natural sunlight during flowering.
It seems that plants (in general, since I grow vegetables of all varieties) can make use of a great deal more red light, during flowering; they don't seem to miss blue-side spectrum when I switch from MH to HPS <(But that's merely my own casual observation, the accuracy of which is certainly up to debate.)
ergo,
I expect if you were to take a look at light-spectrum cast by magenta/red only LED's and even perhaps HPS lamps, you might find that those lamps produce a superior red-spectrum when compared to the sun itself, and therefore produce more growth than the sun itself! [Assuming the lamps in this example were comparably as intense as the sun, which I will speak about next]
The matter of intensity is a different story. I've heard say --(and hearsay is just that)-- that direct sunlight is essentially comparable to 1000watt HID's. This, of course, being dependent on variables such as weather, altitude, angle of sun in the sky. etc, etc...
And sunlight is free.
Now, since LED grow lights are considered 'twice as effective per watt' as your HID's (a dubious claim, gentlemen! Though I'd still love to believe it...), I wonder what these plasma lamps will claim per wattage? (you know, to offset their exorbitant prices!)
