PFO lighting question

[saltjunkie]

Ok, here it is.
I have a PFO 175 w mh........
It was time to replace the bulb. the one i have has been in almost a year.So i get a new one locally,paid a lil more then the net. but felt more comfortable with my purchase.
Get it home, fire it up...... for about a week, it works great. Then it started actin silly,, it will start to fire. and then just shut off.
So i take it back... get a new one (buying locally worked great!)
Get it home. fire it up. awsome light, great color. been needing it. I also at this time put my reflector in.
After 3 days, this one starts doing the same thing.. starts to fire, then just goes off.
but both times i threw my old bulb in there... like now.. and it works great. fires right up. nice and bright. the color is a lil different from the new ones. but i do not believe it has shifted a whole lot......
but i have a 75 dollar new bulb that i wanrt to use?
what might be the problem?

 

[aliendomain]

Is the new bulb the same brand as the old one? And what is the Kelvin? You may want to try to get the same brand and model for the replacement. Sounds like there is an incompatibility with the new bulbs and your ballast.