When frequency and phase of both generator output waveforms is on top of each other then when light is out - flip switch to couple generators together in circuit. Small resistor added to run in Simulator. Slight changes in phase or frequency will freeze simulation.
This can be dangerous if generators do not stay in close sync.
A YouTube video shows a pair of three phase generators being coupled with three neon lamps.
https://youtu.be/RGPCIypib5Q?si=NT8WCyvCV0XTfoFN
