Will this work? Run 2x as many LEDs with same current, using tri-state logic.

I'm trying to analyze the circuit with this method but I don't know how I'm supposed to integrate the voltage drop of the LEDs into the equations:

[edit]

Okay, working with a simpler circuit, I think I'm supposed to add the voltage drop at each stage. (Add, not subtract because the equations use electron flow so everything is backwards.)