Depends what it's wiring diagram says for the given lamp. There were a few ballast topologies in use, some were designed to run the lamps without anything, some (mainly the newer, more efficient ones, so with lower OCV) were requiring the use of ignitors. Some needed the capacitor as part of the resonance voltage boost for ignition, so there you need to put the exact specified capacitor, others used the capacitor just as a PFC connected parallel to the mains input, the second one won't really need it at all if the power factor is not your concern.
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