hmm...spawned 10000 vehicles consisting in just a cube doing nothing with just adding a pointlight in init chassis but keeping it allways switched off. fps drops terribly. Not useable

. So for today I will stay with a mix of lots of static emissive texture lamps and few real pointlight lamps (vehicles) for now. Possibly switching on and off according to view distance the "few" (500) real pointlights.
I hope when scriptable scenery objects will become available it will be possible to have tens of thousands of them .
Maybe I'll try to apply some fast k-NN nearest neighbour search algorithm to just spawn "on the fly" the few tens of real point-lights and remove them from scene as soon as they exit the k-NN range around the camera position.