Difficulty with viewpoint when using 3 ppt lights

[Vbents]

Sorry I'll make my question more clear.
We run the simulation with 3 lights, one for the head and 2 physically connected to each other. We want to draw a line between the two connected lights in VR-space to make a virtual "wand."
When we do this using absolute corodinates the wand works when you move it left, right, up, and down (if you're facing in the positive z-axis). However, when we move it in the z-axis it moves in the wrong direction. We tried negating the value at the z-axis but that didn't seem to help.

Sincerely,
Desperate-In-Stanford