Lots of changes in P3V v4. Most of which don't affect how we make and use scenery for ourselves so we haven't dived in too far.
Have a look at FSDeveloper.com, there is some discussion over there.
Or just Google "dynamic lighting P3D V4".
Hope this helps.
Adding Dynamic Lighting P3D V4
Moderators:DBushell, fsafranek, admin, mickeyd
Frank Safranek - Team SDB Scenery
Mirage Aircraft for Flight Simulator / Alphasim-Virtavia Paint Crew
Mirage Aircraft for Flight Simulator / Alphasim-Virtavia Paint Crew