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Here the capacitor serves two purposes:
- Power factor correction, for that the optimum value is 12uF. But PFC is not needed for lamp operation, unless you have large installation.
- Current path for the rather high frequency ignition pulse primary current (valid for semiparallel ignitors). But the capacitance is by far not critical then, anything above ~1uF is enough, but the wiring loop capacitor-ballast-ignitor-capacitor have to be kept as short as possible (so these three components as close together as possible, interlinked with short wires).
The superimposed ignitors do not need this functionality at all.
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