From my understanding, there are different types of ballast. Normal output ballast for T8, which requires a starter are the cheapest. T5 requires e-ballast & T5HO works better with HO e- ballast, which is quite expensive. For e- ballast, there are rapid start type & programed start type.
Better e-ballast usually has special circuitry to protect the tubes, such as the ability to cease working when the tube is end of life & reset it when replacement has been done.
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