According to Bohr’s theory at least 13.6 Volts of energy is required to free the electron from its ground state, therefore creating true ionization. It is important to maintain a voltage above this minimum to create a level of ionization that allows for saturation to occur.
Low power levels can produce ionization, but these released ions will recombine as fast as they are produced. Increasing creation faster than they can recombine is essential; you need a regulating and adjustable source of power.
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Conversely, providing too much power to the bath can create a tunneling effect in which the flow overcomes the amount of alloy plate surface available and the overall electrolysis effect lowers.
More is explained in the following video: