Ebay, I don't care what anyone says, the cheap bulbs look identical to the $90 ones, just paid 47.50 shipped for two 250w 20,000k china bulbs. Swap them out at 6 months instead of 9 the way I see it. These are rated for 9000 hrs but they will fade over time. I would like to see a par comparison between the cheapos and the name brand... Anyone done that before?