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Can one use any non-polar capacitor rated at the mains voltage (230V for us here)

I tried using this method as follows: 1. Calculate the VARs by taking the square root of the difference of the squares of the VA and Watt value. 2. Divide the square of the Volts by the VARs value to obtain the impedance. 3.The capacitor value for pf = 1.00 is supposed to be the reciprocal of...

I tried using this method as follows: 1. Calculate the VARs by taking the square root of the difference of the squares of the VA and Watt value. 2. Divide the square of the Volts by the VARs value to obtain the impedance. 3.The capacitor value for pf = 1.00 is supposed to be the reciprocal of...

Could anyone give a good definition of near-field and far-field photometric measurements and their use.

Please could someone clarify what near field and far field photometry are and when they are appropriate. I am measuring luminaires and would like to understand what the differences are so I do not make erroneous reports.

Please could someone give me details of what exactly these standards are or where to find out their exact description. I seem to have come across very little on this and also some of it is conflicting and confusing.