One of my T-5 fixtures, Agro-something, also recently blew its ballast. I went and bought a replacement but want to open the blown one up and just swap in a new ballast. That way it is an easy job that is just verifying the way the old one was wired and slap it in, connect it up and close the patient back up. Then maybe I will replace the 2 tube fixture with the repaired 4 tuber.