Synchronizing of 3 phase alternators || 3 dark lamp method for Synchronizing part 2

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How the single lamp glow?
As the single lamp has to glow it is to be connect one leg to phase and another leg to neutral connection in a simple circuit . Lamp glow or dark speed depends upon their frequency difference. But how during syncronisation lamp gets phase and neutral connection?
As our goal to match the phase angle resultant frequency is either higher or lower then how the current is flow from and which direction or how it's gets neutral connection so that it glow?