I used point lights. I tried with spots but they were kind of strange.
There are probably a million different optimizations and adjustments I could have made but it seemed fairly pointless because attaching the lights to a vehicle wasn't a persistant way of keeping them in the world. I had to reposition them every time I restarted the engine.
I had real pain originally positioning them. I hacked a BMW and tried to 'drive' them into position. That was ok until I realized that the handbrake on the BMW didn't work and when I was in the air the BMW started rolling down the runway
![Smiley :)](http://forum.outerra.com/Smileys/default/smiley.gif)
Anyway.. file is attached if you want to play with it... You can edit the first few variables in the script file to adjust for the runway length and width, light intensity etc.
light_z is the distance they are up from the surface.
I'm really looking forward to a permanent solution.