Plasma light has a nice looking emission spectrum, but the PAR efficiency is just OK for today's standard. The one you linked is 1.11 micromol/J (=micromol/s/W). Table 3 of the following paper PLOS ONE: Economic Analysis of Greenhouse Lighting: Light Emitting Diodes vs. High Intensity Discharge Fixtures
has the efficiency of other light. Best LED and 1000W HPS is giving about 1.70 micromol/J. Some cheaper/older LEDs can be worse than the plasma. Florescent light (T8) is around 0.84 micromol/J. Also, the last time I looked at Plasma, the fixture was pretty expensive.
Thanks for the info naoki. I have found a bunch of info online plus there are many videos comparing them to other lights using meters and everything. The vast majority of information I've found seems to heavily favour these lights and praise them highly. My issue is that I'm a bit old school and all the information I've found is only a bit helpful as I do not know the credibility of any of the people posting the information or videos.
To me the source of information I trust the most is fellow growers like our co-members especially ones that have experience directly related to the issue at hand. I still very much appreciate your feedback and I hope more members will chime in.
The Luxum plasma light engine is most similar to HID, consider it as HID withought the arc/electrodes. It's full spectrum as HID because it's filled with similar type of gas inside for making lights. It's a fancier way to put out HID type of lights. The cost is still high compares to HID because it's newer rechnology. It's used in some Panasonic TVs but those light engines were discontinued a few years later.