Well sometimes a new bulb in an old ballast wont work.

Have you tried the old bulb again?

If even the old bulb throws the breaker with nothing else on it, might as well toss the ballast.

Of course when the Old bulb was ;stuck; how did you unstick it out of curiosity?
HARDDON Reviewed by HARDDON on . Problem at the PPP grow were getting close to flowering so i was getting the basement set up early that way all i had to do was move the plants and turn everything on down there on a 12 12 cycle....after i hung my chains for my 400 w mh ( dont have an hps yet but was gonna get one after this harvest ) i was hanging it and plugging it in and it wouldnt come on...it just kept throwing the breaker, i have no idea why it wouldnt come on b.c b4 i started growing i went out and bought a new bulb and plugged it in ( in the Rating: 5