250 hqi glows

[pirate]

Well I woke up today and 1 of my hqi lights was not lit. Now when I look at the bulb it is glowing. I'm not sure how old the bulbs are. Now what do I change is it the bulb or is it the ballast?
The fixture is a 2 250 w hqi with pc in between them made by aquaspacelight. The pc light do not work and have been told by the previous owner said it need a ballast for them, I have not tested them as I do not have the bulbs.
Or do I now just change the fixture and go with something newer/better? maybe?
Thanks