Shit Sylvania 8w T5

I bought 10 of these Sylvania fluorescent tubes for my Beta 5 conversion that is on a dusk til dawn sensor. One of them only last a few weeks. The other failed after just 3 months. This one has failed tonight making it the 3rd replacement in less that a year. I only use these as I don't want to use my nicer tubes but they really do take the piss in terms of their lack of quality. I know I shouldn't be that surprised at this really. They are without doubt the worst tubes I have ever owned.