Okay, Don, forgive me for copying your words above and changing a few...
Assume the fixture is fed with wire having a voltage drop of 1.8 volts for the cold lamp and 0.3 volts for the hot lamp. I=E/R so the current through the 0.015 ohm metallic path would be 120 amps for the cold lamp and 20 amps for the hot filament.
What I did was instead the human I substituted a metallic path with a 0.015 ohm resistance. I kept your math the same.
