I went to J&L on the weekend and picked up one XM 10K 400 bulb. (I use the son agro ballasts btw) So far I'm very happy with the color and intensity.
I have a 2 month old Ushio beside it and they are almost identical to my eyes in terms of color and brightness. I'm curious to see how much mileage I get out of one because of the overdriving, but at this point, I'm pleased with the quality of light, especially when you consider the pricing.
