Underbody lights using props and spotlights

So I've been playing for most of the afternoon with props in an attempt to make underbody lighting work. So far I've managed to get a light to shine at the ground from the underside of the car while the vehicle is running.

Walls I've hit and am unable to get over:

- Spotlight is a tiny spot on the ground, I need to make the angle wider to extend the light to the edges of the car

- The refnode triangle I have chosen I don't think is perfectly level with the car, is there a default set of...

Underbody lights using props and spotlights