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They can be used to ensure simple choke and igniter or transformer power supplies run efficiently. In more complex transformer circuits capacitors can used to give more accurate power control of the lamps, providing power output that is independent of fluctuations in mains voltage.
Furthermore, what is the role of capacitor in tube light?
A tube light consists of a filament & a choke or inductor for the lightening purpose. So, when supply is given to it, we can see a delay in its switching action. An inductor doesnt allows sudden change in its current; so after some time it glows. So, a capacitor is connected in parallel with thius circuit.
Secondly, what is use of ignitor in HPSV lamp?
There is an ignitor built into the ballast which sends a pulse of high voltage energy through the arc tube. This pulse starts an arc through the xenon gas. The lamp turns sky blue as the xenon lights. The arc then heats up the mercury and the mercury vapor then lights, giving the lamp a bluish color.
The capacitor is (in most common fluorescent lamp circuits) is for power factor correction. Since there is a coil in the ballast, the capacitor is used to bring the power factor back towards unity.