Not economically feasible yet. The company I spoke to about it said their most powerful bulb was equivalent to somewhere between 400-600W HPS or MH, but with a fuller spectrum. However, they cost between $1,600 to $2,000 depending on the style of fixture, manufacturer, etc. You can get a full digital 1000W setup for less than $400 total, and if you are really feeling the need for extra specturm, check out the
Hortilux Blues for some supplemental spectrum, for less than $180, not thousands. Not to mention, these plasma lights aren't proven in the horticultural field, where MH and HPS have been used for a long while! The only plus side I see to the plasmas is that the bulb (supposedly) lasts forever.
Here is the plant light sensitivity scale (rainbow) with the spectrum of a plasma light (in white) and a HPS light (in grey) overlaid on it.
This is a standard
Hortilux SuperHPS
and this is the
Hortilux Blue
as you can see, you can create a similar spectrum using a combination of HPS and the HortiBlues, IMO.
I think plasmas are promising for the future, but much like LEDs, are just not suitable, practical, or economical just yet for the everyday grower.
Just my 2¢