Use what formula ?

I want to buy some capacitor for arc suppression for my table lamp (

12 Volt bulb ) . I am not sure what value to use, for eq, 0.22 uf, 0.1 uf or 0.01uf . I would like to know is there any formula to calculat the actual value. Does any one know of a formula ? Thanks for help.
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mowhoong
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