Dynamic lights that pop in and out of view means your sim has hit the limit it can display, typically caused by many addons. We highly recommend increasing the number of Dynamic Lights P3D can render. The default value is too low for a common install with various addons. Instructions: - Find and open your Prepar3D.cfg file, typically found here: C:UsersYOURUSERNAMEAppDataRoamingLockheed MartinPrepar3D v5You may need to enable hidden folders to view the “AppData’” folder.- Find these lines:MAX_POINT_LIGHTS=MAX_SPOT_LIGHTS=- Increase both values to at least 500 and save the file.