After RC parallel circuit O/P = 230v . It restricts amount of current only..Because its doesn't restrict voltage..
How can it restrict current but not voltage?
for the purpose of this circuit it acts as a resistor with the value given by the real part of the reactance.
If your input voltage is 220V, then do your calculations as if it were 320V.
You then have the reactance, a resistor, and a structure with a fixed voltage across it all in series.
if you remove the LEDs (15 * 3.4V) = 51V then you can model the rest as a voltage divider (for the capacitor voltage), and series resistance s for current.
You have the reactance and the resistance in series (with 320V - 50V = 270V across it) and ohms law will tell you the current. From that you can calculate the voltage across the resistor and thus (when you add 50V) the voltage across the capacitor.
For the purposes of these calculations, ignore the resistor across the capacitor on the mains side of the bridge rectifier and the bridge rectifier itself.
This gives steady state operating characteristics, it works slightly differently as the power is applied or when there's a spike