Electronic rapid start ballasts and t-8 tubes.
In my opinion, they're the best thing that ever happened in Flourescent fixtures.
Make sure the fixture is grounded properly, flourescents perform much better when the body of the fixture is grounded properly and the fixture body is parallel to the tubes.
A lot of time can be wasted on flourescent fixtures. Check the mounting between the ballast body and the housing. Sand the paint off at the mount point on the ballast and on the fixture. Make sure the ground has a good connection, not wire to paint.
[URL="http://www.houserepairtalk.com/announcement.php?f=39&a=6"][size=3]The Ten Commandments of House Repair Talk[/size][/URL]
[URL="http://home.bellsouth.net/p/s/community.dll?ep=16&groupid=289528&ck="]Square Eye's home page[/URL]