I have a few four foot T5 tubes that we can test your fixture with.
Ballastwise is THE place to pick up replacements: http://www.ballastwise.com/ http://www.ballastwise.com/
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I have 8 54watts t5 light fixture. It seems that I have 4 ballast and 4 bulbs are not working. I guessing that two ballast are bad. How can I make sure that is what I need? Any ideas on finding cheap a replacement?