Hey Yall,

I just got a 400w MV lamp and am looking for a good quality ballast for it. Anyone know where i could get one?

Here's a vintage GE ballast. However, you may need a capacitor.

One of these will do the trick.

https://www.ebay.com/itm/195409861503

I usually buy my ballasts locally from lighting stores to save on shipping but in this case it ships for free.

Very easy solution is just buy one of those cheap MH highbays off of FB marketplace. Comes with a socket and everything and works great.