Actually, I'd have no problems using the units he showed. Most HID's were designed for streets, warehouses and factories, but not all are rated for humid enviornments. And, it's a common style that I've personally seen in use by professional indoor gardeners. Less cords for a tidy growroom, and the bulbs run hotter than the ballast ever could, if heat is your concern. (heat doesn't sink) And if heat is a concern, you've already provided proper ventilation, no?

Made in America, rated for humid enviornments, commercial quality...I'd have no problems effectively using that set-up. Biggest problem I could see for most indoor gardeners is hangin' 'em and raising 'em. But...there's cheap hardware for that, too.

For a beginner, or someone without electronic ability...I'd go to E-Bay for a new package. Watch out for deals on new units that sound too good to be true. They are usually untrustworthy crap.