Bad Ballast

[ynot75]

Hello everyone, I have metal halides on my 90 gallon which have worked flawlesly for sometime now. However, just recently one of the two lamps didn't light up. so after a few strikes and time for cooling down I decided to swap the bulbs to obviously rule that out. Unfortunately both bulbs are ok. I guess my question is do I have to replace the ballast? and if so will the new ballast work with the inputs on the existing light fixture?

 

[2quills]

Sounds like a bad ballast. If so then it will need to be replaced. But since this is a fixture then it could also be a switch or possibly a capacitor, or maybe even just a bad connection. Who's the manufacturer of the fixture?

 

[acrylic51]

Agree with Corey.....Worse case cut the connector off the old ballast and rewire it into the new ballast.

 

[flower]

Welcome to the site!
You didn't say what kind of light unit....If it is a coralife MH unit...it takes those pulse bulbs. I thought I had a bad ballast, they even replaced it, it turned out I had bought regular mogul bulbs when I needed one with a starter on it. That is when Coralife explained they use a pulse type of light and it takes certain bulbs.