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Oh I see what you mean. They use the the AC side of the voltage regulator, have a diode somewhere that converts it to an unregulated DC which is why there is flickering.
I have a bike where the manufacturer does something similar to what you are doing but they do this. They use the unregulated DC to turn on the relay which then connects the battery/voltage regulator output to the headlight. That way, the headlight remains off until the bike starts saving all the battery energy for the starting process.
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