Does anyone know exactly what these settings change? Does this only affect the default airports? I'm assuming it doesn't do anything for 3rd party airports since they're using their own custom textures.

RUNWAY_LIGHTS_SURFACE_SCALAR=0.30
RUNWAY_LIGHTS_VASI_SCALAR=0.20
RUNWAY_LIGHTS_APPROACH_SCALAR=0.10
RUNWAY_LIGHTS_STROBE_SCALAR=0.30

From an old document dating back to my FS9 era ...

[DISPLAY]
RUNWAY_LIGHTS_SURFACE_SCALAR=1.00 //scales edge, center, end,touchdown,runways
RUNWAY_LIGHTS_VASI_SCALAR=1.00 // scales VASI lights
RUNWAY_LIGHTS_APPROACH_SCALAR=1.00 // scales approach light bars
RUNWAY_LIGHTS_STROBE_SCALAR=1.00 //scales RAILs and ODALs

Note that TAXIWAY EDGE Lights (blue) and TAXIWAY CENTERLINE Lights (green) can NOT be scaled using the FS9.CFG file

I would guess that it still applies to P3D.

Thanks! Is there a way to test our settings after each edit without having to exit and reload the sim? It takes  quite awhile for me to load up P3D v5. About 5+ minutes.

Chaps, is there some trick to getting runway lights to come on in v5 during daytime? In overcast, low vis situations, they do not come on. As I type, perhaps due to truesky (beta)?

8 minutes ago, daelight said:

Chaps, is there some trick to getting runway lights to come on in v5 during daytime? In overcast, low vis situations, they do not come on. As I type, perhaps due to truesky (beta)?

Yes there is a threshold for day and night for the lights to come on earlier, but I forgot exactly what it was. Maybe somebody else here can help. You just need to add those entries into your prepar3d.cfg file. Also on cloudy days the runway lights should come on, I agree. They also don't for me and thats unrealistic. I'm not sure if there's a setting for that one in particular.

1 hour ago, captain420 said:

Thanks! Is there a way to test our settings after each edit without having to exit and reload the sim? It takes  quite awhile for me to load up P3D v5. About 5+ minutes.

Unfortunately, a restart is required for the new values to be applied.