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If you measure the battery voltage before starting the scooter what do you measure? It should be around +12.8 volts. What do you measure after you start it? It should be above +12.8 volts at all rpm, more like +13 to +14 volts. If it drops below +12.8 volts at any rpm then something is wrong most likely the regulator.
I have had two regulators that charge fine at idle but at higher rpm, the regular failed causing the battery to discharge. One of them was around 2,000 rpm. It would be charging at 2,000 rpm but by 2,200 rpm it was discharging the battery.
There should be no reason why the voltage to the headlight should be +10 volts. It should be close to the battery voltage.
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