Real world numbers from this morning.
12.1vdc engine off
12.5 vdc low idle, no lights
14.1 vdc @1K rpm, and @2k rpm, no lights.
Lights on @ idle, voltage started @12.5 vdc, dropped to 11.7 vdc and held steady. Ammeter is in the negative territory.
Lights on @1,500 rpm, 12.9 vdc, slowly climbing, ammeter is in the positive territory.
I dug out a clamp meter that is good for DC amperage, it's a solid 9amps of current on the positive lead that supplies the new lights.
@1,500 rpm that went up to 9.5 amps.
All @ 50F in the garage.