ballast and light

do i need a ballast for any wattage of hps/mh lights? or just the higher wattages

huh?

400watt bulb for a 400watt ballast. They have to match wattage.

Yeah man, all High Intensity Discharge (HID. All HPS and MH bulbs) require a ballast.

dankyou man.............

If you're in the US you can get the little econolight 150w hps's for $20. Includes ballast and bulb:
http://forums.slickdeals.net/showthread.php?t=1096767

Best deal anywhere.