How cheap can i get a ballast for a 400 watt ligh bulb for?

Question

and where?

Answer 1

Well that depends what kind of bulb you have. Metal halide and high pressure sodium ballasts can run from $100 to $300. Digital ballast are more efficient than standard magnetic ones but cost a little more. Your best bet is check Ebay. Another option to buying a plug-and-go ballast is to build one yourself. You can get a ballast kit for about $50.

If your looking for a recommendation: Spend the extra money and get a high end digital ballast. They cost less to run, can usually operate on a variety of power supplies,  and increase bulb life. You should be able to find a 400 watt on Ebay for $150.