It still has a regulator. Just no battery. So voltage stays constant at 12V like any other vehicular system. I don't know how many amps it draws, but it should be easy enough to figure out. The bulb should have a wattage marking on it...light bulbs are simple resistive devices, so you can just divide the watts by 12 to get your amperage.
So, what I found out, is that it varies from about 6 volts, to 60 volts AC!, depending on the revs. I couldn't believe that it was AC, but that's what my stator makes I wanted to add LED lights, so what I did, was add a rectifier, to change the voltage from AC to DC, a capacitor, to keep the LEDs from flashing, and some resistors to limit the voltage spike, and I have two good LEDs.