430wttr's what a wack number. lol. it is funny though, my shop carries bulbs but not balast too for them. i guess there the odd man or something, that 30 wtt's really aint something ur missing from a 400. might as well go for a 600. But then again im sure u thought about that. GL, personally i would just get a 400, just becuase i can find a wider selection of bulbs at my store. But i guess it depends on your situation.