This will be my first time using this HID lamp. I got it from HTG via eBay and it was pretty inexpensive ($119). If this grow goes well I will probably invest in a digital ballast, efficiency being the biggest draw. I've heard or read somewhere that cheap HID ballasts can perform as poorly as 50% efficient...which means your 400w lamp is actually drawing significantly more from the wall.

Hope you have fun with your new toys. You'll be including this hut in the thread you started for the Durban, right?