In addition to the gear required to start and operate a fluorescent lamp, i.e. a Starter and a Ballast, which is also included in the inductive circuit , a capacitive circuit for one lamp also has a series capacitor to compensate the inductance. In fact ballast inductance is overcompensated by the capacitor, i.e. capacitance is really excessive. That permits a further single inductive circuit to be compensated as well. This form of compensation produces a ripple frequency blocking circuit.

overcompensated cos j ~0,5 kap.
Type code : c