Fluorescent & Discharge Lamp Capacitor

Discharge lamps (Fluorescent lamps, halogen metal vapour lamps, mercury vapour lamps and sodium vapour lamps) require suitable chokes or leakage reactance transformers for ignition and also for current limitation during discharge. Due to their inductance, the power factor or cos j is depending on the type, between 0.5 and 0.7. Electricity companies therefor require that the wattless power (sin j) from the chokes or transformers be suitably corrected to cos j = 0.9. To improve the power factor, capacitors ideally designed for the widest range of operating climatic and thermal conditions, should be used