They're promoting a bulb & ballast kit for $120. That'd let you convert a regular screw-in-lightbulb fixture into being a 150-watt HMI fixture. Couldn't be used to convert any conventional professional lighting instruments to HMI... and you wouldn't have a fresnel or PAR type fixture, but in a Chinese lantern it might work well...
They have a 3-lamp version that goes for about $500. But it's basically a "brooder lamp" with three bulbs in it; for $500 I'd probably vote for a conventional DeSisti or Ianiro 575w fixture off ebay.
But the little 150w in a Chinese lantern is intriguing... Might be good to get one to Jarred or one of us to review.
I'm pretty sure I checked out those lights a few months ago and found out they're metal halide lamps, but not HMI's. I also seem to remember that those ballasts are noisy--fine for still work, not so good for film. I may be mistaken about this, but I think it's the same company.