I also bought 2 400w 9 bands from DhGate, which is apparently exactly the same as alibaba. I got both for less that $350 USD. Yeah I am worried about quality, but the price was so good, even if the both burn out after one grow it will hve been worth it to get the first grow done cheap. I can buy new lights for the second as long as the first set works at all.
I noticed mine were built by Nanning Lijie Energy, which seems to be one of the biggest LED companies in China, and they use BridgeLux.
I won't know if they are usable until they get here and I get growing, but the site has a 90 money back guarantee and the lights have a two year warranty.
I can post the link if that is allowed.
I also have access to lumen and PAR testers, so once I fire the LEDs up I will let you guys know how that stuff turns out.
Cheers,
Betelnut